I'm pretty sure that everyone has heard the myth that an opera singer can shatter a wine glass with just the sound of his or her voice. But, it's not that easy; there is a lot of physics behind this phenomenon. In order to shatter the glass, the singers must sing a note that exactly matches the frequency of the glass. A slightly higher or lower note will not shatter the glass. But, how does the glass shatter? With the frequencies approaching the same, the glass will vibrate, or resonate, so much that is simply breaks. Ella Fitzgerald demonstrated this in a very popular commercial in 1972 and the Mythbusters confirmed the phenomenon on air.