Difference between revisions of "Break a Glass with Your Voice"
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| − | + | Thanks to a clever commercial that aired in the 1970s, the image of singers shattering glass with their voice alone has become seared into America's collective consciousness.<ref name="rf1">http://large.stanford.edu/courses/2007/ph210/scodary2/</ref> This may have led you to wonder, “Could I break a glass with my voice?” While there are many factors that will affect how easily you succeed in this task, with enough time and effort, you may be able to reduce a glass to shards with only your voice.<ref name="rf2">http://www.scientificamerican.com/article/fact-or-fiction-opera-singer-can-shatter-glass/</ref> | |
| − | [[Category:Singing]] | + | [[Category: Singing]] |
== Steps == | == Steps == | ||
===Setting the Stage for Glass Shattering=== | ===Setting the Stage for Glass Shattering=== | ||
#Prepare your glass shattering station. Remember, success in this task will result in broken glass, so you might want to practice in a room with hard floors to make clean up easier. Choose a room with good acoustics and little to no echo. You’ll also need a power outlet to plug in your amp if you've chosen to use a microphone, as well as a platform on which your glass and amp can sit. | #Prepare your glass shattering station. Remember, success in this task will result in broken glass, so you might want to practice in a room with hard floors to make clean up easier. Choose a room with good acoustics and little to no echo. You’ll also need a power outlet to plug in your amp if you've chosen to use a microphone, as well as a platform on which your glass and amp can sit. | ||
| − | #*If you plan on using your voice alone to shatter your glass, you'll only need a sturdy platform to place your glass upon. The platform should be relatively high so that you can stand while singing to get the best volume and tone.<ref>http://www.smashinglists.com/top-10-tips-for-singing-better/</ref> | + | #*If you plan on using your voice alone to shatter your glass, you'll only need a sturdy platform to place your glass upon. The platform should be relatively high so that you can stand while singing to get the best volume and tone.<ref name="rf3">http://www.smashinglists.com/top-10-tips-for-singing-better/</ref> |
#*Lay down a large drop cloth if you attempt this in a carpeted area. Small splinters of glass can become embedded in carpet and cause harm later. A drop cloth will keep shattered glass from getting in your carpet. | #*Lay down a large drop cloth if you attempt this in a carpeted area. Small splinters of glass can become embedded in carpet and cause harm later. A drop cloth will keep shattered glass from getting in your carpet. | ||
#*When using an amp and microphone, the amp should be placed facing your glass and relatively close to it. A sturdy coffee table might be sufficient to hold both speaker and glass while limiting distorting vibrations, though the ground might also work well. Try to position your amp so it isn’t blasting sound in the direction of people who might be bothered by it, like your neighbors. | #*When using an amp and microphone, the amp should be placed facing your glass and relatively close to it. A sturdy coffee table might be sufficient to hold both speaker and glass while limiting distorting vibrations, though the ground might also work well. Try to position your amp so it isn’t blasting sound in the direction of people who might be bothered by it, like your neighbors. | ||
| − | #*Your glass should be directly in front of the amplifier's speaker. Look through the material covering the front of your amplifier and find the exact location of the speaker cone. Position your glass right in front of the cone.<ref>http://wonderopolis.org/wonder/how-can-a-voice-break-glass</ref><ref | + | #*Your glass should be directly in front of the amplifier's speaker. Look through the material covering the front of your amplifier and find the exact location of the speaker cone. Position your glass right in front of the cone.<ref name="rf4">http://wonderopolis.org/wonder/how-can-a-voice-break-glass</ref><ref name="rf1" /> |
#Put on safety goggles/glasses to protect your eyes. Shattering glass can produce very small fragments that can cause permanent damage to your eyes. Wearing simple eye protection, like safety glasses or goggles, will prevent this from happening. | #Put on safety goggles/glasses to protect your eyes. Shattering glass can produce very small fragments that can cause permanent damage to your eyes. Wearing simple eye protection, like safety glasses or goggles, will prevent this from happening. | ||
| − | #*If you don’t happen to have protective eyewear handy, you could use a pair of cheap sunglasses or swimming goggles. Be sure that your eye protection covers your entire eye. Half-lens reading glasses will not be adequate.<ref>http://earthsky.org/human-world/resonant-frequency</ref> | + | #*If you don’t happen to have protective eyewear handy, you could use a pair of cheap sunglasses or swimming goggles. Be sure that your eye protection covers your entire eye. Half-lens reading glasses will not be adequate.<ref name="rf5">http://earthsky.org/human-world/resonant-frequency</ref> |
#Find the resonant frequency of your glass. Flick the glass with your fingernail gently and listen carefully to the ringing sound. This is the resonant frequency of your glass, and you will have to match and sustain this pitch to cause it to break. It may help you to hold onto the pitch if you hum it softly to yourself even after the glass has finished ringing. | #Find the resonant frequency of your glass. Flick the glass with your fingernail gently and listen carefully to the ringing sound. This is the resonant frequency of your glass, and you will have to match and sustain this pitch to cause it to break. It may help you to hold onto the pitch if you hum it softly to yourself even after the glass has finished ringing. | ||
#*You can also cause your glass to hum its resonant frequency by moistening your finger and rubbing it along the rim of your glass. Circle the rim of the glass with your finger until it resonates audibly. Then try to hold that pitch in your head. | #*You can also cause your glass to hum its resonant frequency by moistening your finger and rubbing it along the rim of your glass. Circle the rim of the glass with your finger until it resonates audibly. Then try to hold that pitch in your head. | ||
#*You may find using an instrument or tool, like a piano or a pitch finder, can help you identify, hold, and narrow in on the resonant frequency while you’re trying to sing. | #*You may find using an instrument or tool, like a piano or a pitch finder, can help you identify, hold, and narrow in on the resonant frequency while you’re trying to sing. | ||
| − | #*Empty your glass completely, remove decorations from it, and place it on a sturdy, regular surface while you are checking its resonant frequency. Things that are inside, on top of, or connected to your glass could alter this tone.<ref>http://hyperphysics.phy-astr.gsu.edu/hbase/sound/reson.html</ref> | + | #*Empty your glass completely, remove decorations from it, and place it on a sturdy, regular surface while you are checking its resonant frequency. Things that are inside, on top of, or connected to your glass could alter this tone.<ref name="rf6">http://hyperphysics.phy-astr.gsu.edu/hbase/sound/reson.html</ref> |
| − | #Maintain the resonant frequency in your mind. Holding a pitch in your head for a period of time usually results in a flat pitch.<ref>http://www.musicradar.com/tuition/tech/96-vocal-production-tips-437031</ref> A flat resonant pitch won't make your glass shatter. To help prevent yourself from going flat, you may want to hum along or sustain the note with some kind of tool, like an instrument, pitch pipe, or pitch finder/tuner. Hearing very slight differences in tone can be difficult even for talented musicians. | + | #Maintain the resonant frequency in your mind. Holding a pitch in your head for a period of time usually results in a flat pitch.<ref name="rf7">http://www.musicradar.com/tuition/tech/96-vocal-production-tips-437031</ref> A flat resonant pitch won't make your glass shatter. To help prevent yourself from going flat, you may want to hum along or sustain the note with some kind of tool, like an instrument, pitch pipe, or pitch finder/tuner. Hearing very slight differences in tone can be difficult even for talented musicians. |
#*Check your pitch frequently as you attempt to shatter the glass with your voice. Simply flick the bulb of the glass gently with your fingernail, listen carefully to the resulting tone, and tweak your pitch to match it. | #*Check your pitch frequently as you attempt to shatter the glass with your voice. Simply flick the bulb of the glass gently with your fingernail, listen carefully to the resulting tone, and tweak your pitch to match it. | ||
#Aim for a loud volume a pure resonant pitch. Professional vocalists and opera singers are generally the people who attempt this kind of feat due to their vocal strength. You'll need to at least reach a volume of 100 - 110 decibels and match the resonant pitch perfectly for several seconds if you're going to shatter a glass. This can be a difficult feat if you are untrained, in which case you might use a microphone. | #Aim for a loud volume a pure resonant pitch. Professional vocalists and opera singers are generally the people who attempt this kind of feat due to their vocal strength. You'll need to at least reach a volume of 100 - 110 decibels and match the resonant pitch perfectly for several seconds if you're going to shatter a glass. This can be a difficult feat if you are untrained, in which case you might use a microphone. | ||
| − | #*The 100 - 110 decibel range is similar to the noise produced by a nearby power mower, power saw, or motorcycle. To shatter glass, you'll have to reach this volume or louder while singing the resonant pitch.<ref>http://wonderopolis.org/wonder/how-can-a-voice-break-glass </ref><ref>http://www.gcaudio.com/resources/howtos/loudness.html</ref> | + | #*The 100 - 110 decibel range is similar to the noise produced by a nearby power mower, power saw, or motorcycle. To shatter glass, you'll have to reach this volume or louder while singing the resonant pitch.<ref name="rf8">http://wonderopolis.org/wonder/how-can-a-voice-break-glass </ref><ref name="rf9">http://www.gcaudio.com/resources/howtos/loudness.html</ref> |
===Breaking a Glass with Your Voice Alone=== | ===Breaking a Glass with Your Voice Alone=== | ||
#Place your mouth close to the glass. With enough practice and [[Strengthen Your Singing Voice|vocal strength]], you should be able to shatter a glass from a more comfortable distance. Most normal people, however, will have difficulty sustaining the volume necessary for breaking a glass. Being very close will focus your sound energy and give you the best chance possible of making it break. | #Place your mouth close to the glass. With enough practice and [[Strengthen Your Singing Voice|vocal strength]], you should be able to shatter a glass from a more comfortable distance. Most normal people, however, will have difficulty sustaining the volume necessary for breaking a glass. Being very close will focus your sound energy and give you the best chance possible of making it break. | ||
| − | #*To check just how loud you are singing, you might want to download a sound measuring app from the app store on your phone or buy a sound level meter from an online retailer. If you notice that, even at your loudest, you're nowhere close to the 100 - 110 decibel range, you might want to consider using a microphone.<ref>http://www.explainthatstuff.com/soundlevelmeters.html</ref> | + | #*To check just how loud you are singing, you might want to download a sound measuring app from the app store on your phone or buy a sound level meter from an online retailer. If you notice that, even at your loudest, you're nowhere close to the 100 - 110 decibel range, you might want to consider using a microphone.<ref name="rf10">http://www.explainthatstuff.com/soundlevelmeters.html</ref> |
#Sing the resonant frequency pitch. Begin singing the resonant tone at a normal speaking volume. Listen carefully to the sound of your voice. Does it sound sharp (above the resonant pitch) or flat (below the resonant pitch)? If so, make slight adjustments to your tone. When you are confident that you are singing the pitch perfectly, slowly increase your singing volume into you are singing as loudly as you can. | #Sing the resonant frequency pitch. Begin singing the resonant tone at a normal speaking volume. Listen carefully to the sound of your voice. Does it sound sharp (above the resonant pitch) or flat (below the resonant pitch)? If so, make slight adjustments to your tone. When you are confident that you are singing the pitch perfectly, slowly increase your singing volume into you are singing as loudly as you can. | ||
| − | #*If you feel discomfort, pain, or notice a significant change in the quality of your voice, you may be straining your voice by singing too loudly or too long. To prevent permanent damage, you should stop immediately, drink some water. Hold off singing until your voice is back to normal.<ref>https://www.nidcd.nih.gov/health/taking-care-your-voice</ref> | + | #*If you feel discomfort, pain, or notice a significant change in the quality of your voice, you may be straining your voice by singing too loudly or too long. To prevent permanent damage, you should stop immediately, drink some water. Hold off singing until your voice is back to normal.<ref name="rf11">https://www.nidcd.nih.gov/health/taking-care-your-voice</ref> |
#*Vowel sounds will be less obstructed, enabling you to achieve higher volumes. In particular, the "ee" vowel sound has the highest volume rating. The vowel “ay” is also rated very highly for volume. | #*Vowel sounds will be less obstructed, enabling you to achieve higher volumes. In particular, the "ee" vowel sound has the highest volume rating. The vowel “ay” is also rated very highly for volume. | ||
#*Sustain your note as long as possible while making slight adjustments. Even if you hit the resonant frequency dead-on, you’ll have to hold the pitch perfectly for a few seconds before the glass vibrates enough to shatter. More likely you’ll have to “slide” your voice slightly up and down and make slight adjustments to match the resonant pitch. | #*Sustain your note as long as possible while making slight adjustments. Even if you hit the resonant frequency dead-on, you’ll have to hold the pitch perfectly for a few seconds before the glass vibrates enough to shatter. More likely you’ll have to “slide” your voice slightly up and down and make slight adjustments to match the resonant pitch. | ||
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#*You might also want to try glasses of various shape and size. Be sure you check the resonant frequency of each glass with a flick of your nail; each glass will have its own slightly different resonant frequency. | #*You might also want to try glasses of various shape and size. Be sure you check the resonant frequency of each glass with a flick of your nail; each glass will have its own slightly different resonant frequency. | ||
#[[Clean up Broken Glass|Dispose of the broken glass carefully]] when you succeed. Wear gloves when cleaning up to prevent yourself from getting cuts or scraped by a sharp edge. Then examine the area thoroughly to make sure you've picked up even the smallest fragments. A flashlight can help you spot small slivers. | #[[Clean up Broken Glass|Dispose of the broken glass carefully]] when you succeed. Wear gloves when cleaning up to prevent yourself from getting cuts or scraped by a sharp edge. Then examine the area thoroughly to make sure you've picked up even the smallest fragments. A flashlight can help you spot small slivers. | ||
| − | #*You may want to avoid using a vacuum cleaner to suck up your glass fragments. Doing so can cause damage to your vacuum. Instead, sweep up as much as possible with a broom, and capture tiny slivers by pressing a piece of bread into the fragments.<ref>http://www.goodhousekeeping.com/home/cleaning/tips/a24001/surprising-trick-for-cleaning-broken-glass/</ref> | + | #*You may want to avoid using a vacuum cleaner to suck up your glass fragments. Doing so can cause damage to your vacuum. Instead, sweep up as much as possible with a broom, and capture tiny slivers by pressing a piece of bread into the fragments.<ref name="rf12">http://www.goodhousekeeping.com/home/cleaning/tips/a24001/surprising-trick-for-cleaning-broken-glass/</ref> |
=== Breaking a Glass with a Microphone=== | === Breaking a Glass with a Microphone=== | ||
| − | #Protect your hearing. The amplifier will need to be turned up fairly loud in order for this to work, so you should protect your ears from potentially harmful sound levels. A good pair of earplugs might be sufficient, but for very loud volumes, specialty sound dampening ear protectors might be best. <ref>http://www.nhs.uk/Livewell/hearing-problems/Pages/tips-to-protect-hearing.aspx </ref> | + | #Protect your hearing. The amplifier will need to be turned up fairly loud in order for this to work, so you should protect your ears from potentially harmful sound levels. A good pair of earplugs might be sufficient, but for very loud volumes, specialty sound dampening ear protectors might be best. <ref name="rf13">http://www.nhs.uk/Livewell/hearing-problems/Pages/tips-to-protect-hearing.aspx </ref> |
#Prepare your amplifier. Plug in and switch on your amp. You should hear a faint tone caused by the electricity running through it. This means your amp is ready for input. Take the cord end of your mic and plug its audio jack into your amp. | #Prepare your amplifier. Plug in and switch on your amp. You should hear a faint tone caused by the electricity running through it. This means your amp is ready for input. Take the cord end of your mic and plug its audio jack into your amp. | ||
#*You’ll also need to plug a microphone into your amplifier. You should place your mic as far away from the amplifier as the cable will allow to prevent distortion and mic feedback. | #*You’ll also need to plug a microphone into your amplifier. You should place your mic as far away from the amplifier as the cable will allow to prevent distortion and mic feedback. | ||
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#*Remember to wear your ear protection. Also, to minimize your exposure to loud volumes, you should stand behind the amp, or behind it and off to the side. | #*Remember to wear your ear protection. Also, to minimize your exposure to loud volumes, you should stand behind the amp, or behind it and off to the side. | ||
#*If your mic doesn’t work, check it for an on/off switch. If your mic is already switched on but still is not working, check the audio jack to make sure your it is fully connected to the speaker. | #*If your mic doesn’t work, check it for an on/off switch. If your mic is already switched on but still is not working, check the audio jack to make sure your it is fully connected to the speaker. | ||
| − | #Adjust the volume of your amp. If you are using an unfamiliar amp, test its volume at a medium level before attempting to put it on the maximum setting. Most glasses will require you to reach a minimum of 100 to 110 decibels, which is about the volume of a passing motorbike, a nearby car horn, or the music in a nightclub.<ref | + | #Adjust the volume of your amp. If you are using an unfamiliar amp, test its volume at a medium level before attempting to put it on the maximum setting. Most glasses will require you to reach a minimum of 100 to 110 decibels, which is about the volume of a passing motorbike, a nearby car horn, or the music in a nightclub.<ref name="rf8" /><ref name="rf14">http://www.nhs.uk/Livewell/hearing-problems/Pages/tips-to-protect-hearing.aspx</ref> |
#*You may want to layer the wall your amp is pointed at with sound dampening material, like heavy blankets or cushions. This will prevent the loudness of your amp from aggravating others. | #*You may want to layer the wall your amp is pointed at with sound dampening material, like heavy blankets or cushions. This will prevent the loudness of your amp from aggravating others. | ||
#*Other sound dampening measures you might make use of include [[Build an Acoustical Panel|acoustic panels]], [[Buy Soundproofing Curtains|soundproof curtains]], and [[Reduce Noise Levels in Your Apartment|other techniques]]. | #*Other sound dampening measures you might make use of include [[Build an Acoustical Panel|acoustic panels]], [[Buy Soundproofing Curtains|soundproof curtains]], and [[Reduce Noise Levels in Your Apartment|other techniques]]. | ||
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#*If your glass refuses to break, check your pitch with a pitch finder. The pitch you are singing might only be off a slight bit, but this can prevent your glass from breaking. | #*If your glass refuses to break, check your pitch with a pitch finder. The pitch you are singing might only be off a slight bit, but this can prevent your glass from breaking. | ||
#*Vowels are less obstructed and will help you to achieve louder volumes. In particular, the "ee" vowel sound has the highest volume rating. The vowel “ay” is also rated very highly for volume. | #*Vowels are less obstructed and will help you to achieve louder volumes. In particular, the "ee" vowel sound has the highest volume rating. The vowel “ay” is also rated very highly for volume. | ||
| − | #*Sustain your note as long as possible while making slight adjustments. Even if you hit the resonant frequency dead-on, you’ll have to hold the pitch perfectly for a few seconds before the glass vibrates enough to shatter.<ref | + | #*Sustain your note as long as possible while making slight adjustments. Even if you hit the resonant frequency dead-on, you’ll have to hold the pitch perfectly for a few seconds before the glass vibrates enough to shatter.<ref name="rf6" /> |
| − | #*Since you are using amplification, you shouldn’t need to shout into the microphone. Speaking loudly puts strain on your voice and can do permanent damage if you’re not careful. Sing into the microphone at a moderate volume and take a break whenever your voice feels tired.<ref> http://www.drugs.com/health-guide/vocal-cord-disorders.html</ref> | + | #*Since you are using amplification, you shouldn’t need to shout into the microphone. Speaking loudly puts strain on your voice and can do permanent damage if you’re not careful. Sing into the microphone at a moderate volume and take a break whenever your voice feels tired.<ref name="rf15"> http://www.drugs.com/health-guide/vocal-cord-disorders.html</ref> |
| − | #[[Clean up Broken Glass|Dispose of the broken glass carefully]]. A pair of rubber gloves will help prevent you from getting any nicks or cuts from the glass while cleaning. You may want to use a flashlight to help you find difficult to see fragments. Pick up and throw away large pieces of glass with your hands, sweep up smaller fragments, and use care when vacuuming. Glass fragments may cause damage to your vacuum cleaner.<ref | + | #[[Clean up Broken Glass|Dispose of the broken glass carefully]]. A pair of rubber gloves will help prevent you from getting any nicks or cuts from the glass while cleaning. You may want to use a flashlight to help you find difficult to see fragments. Pick up and throw away large pieces of glass with your hands, sweep up smaller fragments, and use care when vacuuming. Glass fragments may cause damage to your vacuum cleaner.<ref name="rf12" /> |
#*A common trick for picking up small shard and slivers of glass uses a slice of soft sandwich bread. Press your bread into the floor wherever you see glass. The glass should get caught into the bread, which you can throw away when the glass is clean or the piece of bread is full of glass. You may need to use several pieces of bread to clean the entire area. | #*A common trick for picking up small shard and slivers of glass uses a slice of soft sandwich bread. Press your bread into the floor wherever you see glass. The glass should get caught into the bread, which you can throw away when the glass is clean or the piece of bread is full of glass. You may need to use several pieces of bread to clean the entire area. | ||
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== Tips == | == Tips == | ||
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*Always wear protective goggles to prevent glass injury to eyes. | *Always wear protective goggles to prevent glass injury to eyes. | ||
*If you have difficulty hearing a musical pitch and then matching that same pitch with your voice, you may want to invest in some [[Find an Inexpensive Voice Teacher|voice lessons]] before attempting this. | *If you have difficulty hearing a musical pitch and then matching that same pitch with your voice, you may want to invest in some [[Find an Inexpensive Voice Teacher|voice lessons]] before attempting this. | ||
| − | *You can place a straw in the glass to help you see when it is vibrating with the pitch of your voice. This will help you find the right pitch.<ref>http://www.meyersound.com/news/2005/myth_glass/</ref> | + | *You can place a straw in the glass to help you see when it is vibrating with the pitch of your voice. This will help you find the right pitch.<ref name="rf16">http://www.meyersound.com/news/2005/myth_glass/</ref> |
| − | *You can also break the glass by singing its resonant frequency (the pitch that causes an object to “hum”) an octave higher (twice the frequency) or an octave lower (half the frequency).<ref | + | *You can also break the glass by singing its resonant frequency (the pitch that causes an object to “hum”) an octave higher (twice the frequency) or an octave lower (half the frequency).<ref name="rf6" /> |
| − | *Every glass will be different and have a unique resonant frequency. Even imperfections that are invisible to your naked eye can cause a glass to resonate at a completely different pitch.<ref | + | *Every glass will be different and have a unique resonant frequency. Even imperfections that are invisible to your naked eye can cause a glass to resonate at a completely different pitch.<ref name="rf6" /> |
| − | *The TV show "Mythbusters" explored whether it was possible to break a glass with voice. The results of this experiment led the hosts to recommend “sliding” your pitch up and down when searching for the resonant frequency of the glass.<ref>http://kwc.org/mythbusters/2005/05/mythbusters_breaking_glass_a_r.html</ref> | + | *The TV show "Mythbusters" explored whether it was possible to break a glass with voice. The results of this experiment led the hosts to recommend “sliding” your pitch up and down when searching for the resonant frequency of the glass.<ref name="rf17">http://kwc.org/mythbusters/2005/05/mythbusters_breaking_glass_a_r.html</ref> |
| − | *Crystal glasses will likely work better for this than with other types of glass.<ref>http://www.physlink.com/Education/AskExperts/ae479.cfm</ref> | + | *Crystal glasses will likely work better for this than with other types of glass.<ref name="rf18">http://www.physlink.com/Education/AskExperts/ae479.cfm</ref> |
| − | *You can find the approximate resonant frequency, and the pitch you’ll need to imitate, by rubbing a moistened finger around the rim of your empty glass. This should produce a humming sound. That sound is the resonant frequency of the glass.<ref>http://www.physlink.com/education/askexperts/ae479.cfm</ref> | + | *You can find the approximate resonant frequency, and the pitch you’ll need to imitate, by rubbing a moistened finger around the rim of your empty glass. This should produce a humming sound. That sound is the resonant frequency of the glass.<ref name="rf19">http://www.physlink.com/education/askexperts/ae479.cfm</ref> |
== Warnings == | == Warnings == | ||
*Shattered glass can be dangerous. Use care when cleaning up broken glass. | *Shattered glass can be dangerous. Use care when cleaning up broken glass. | ||
| − | *Turning up your amplifier to its maximum volume can result in damage the amplifier, your speakers, and possibly your eardrums as well.<ref> http://www.audioholics.com/home-theater-connection/avoid-blowing-speakers</ref><ref> https://www.nidcd.nih.gov/health/noise-induced-hearing-loss</ref> | + | *Turning up your amplifier to its maximum volume can result in damage the amplifier, your speakers, and possibly your eardrums as well.<ref name="rf20"> http://www.audioholics.com/home-theater-connection/avoid-blowing-speakers</ref><ref name="rf21"> https://www.nidcd.nih.gov/health/noise-induced-hearing-loss</ref> |
| − | *Be careful to avoid flying glass. Heavy metal singer Jim Gillette has been cut by glass when performing this feat, so exercise caution while attempting.<ref> http://www.meyersound.com/news/2005/myth_glass/</ref> | + | *Be careful to avoid flying glass. Heavy metal singer Jim Gillette has been cut by glass when performing this feat, so exercise caution while attempting.<ref name="rf22"> http://www.meyersound.com/news/2005/myth_glass/</ref> |
| − | *Breaking a glass with your voice without amplification is extremely difficult. In the beginning, it’s unlikely you’ll succeed. However, with practice and training, you could learn how to shatter glasses with a high rate of success, or even shatter multiple glasses at once. <ref | + | *Breaking a glass with your voice without amplification is extremely difficult. In the beginning, it’s unlikely you’ll succeed. However, with practice and training, you could learn how to shatter glasses with a high rate of success, or even shatter multiple glasses at once. <ref name="rf16" /> |
== Things You'll Need == | == Things You'll Need == | ||
