Search: how can a high note break glass
Why: Last night at the Starlight Bowl, soprano Athena Mertes sang so high it made my ear canals tingle.
Answer: It's not really the note. It just has to be loud enough:
They go out and get a drinking glass with high lead content, tunk it with a rubber mallet to make it ring, then read the frequency on an analyzer. Then they get a singer to sing the same note (typically F above middle C), amplify it to maybe 92, 94 decibels, and with luck you get glass shrapnellini. Memorex technicians using a strobe have found that prior to the break the sound causes the rim of the glass to deflect as much as a quarter inch. (I get this from Rick Needham, engineering manager, lest you think I am making this up.)Source: The Straight Dope
The More You Know: Singer and voice coach Jaime Vendera did it on MythBusters:
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