Purpose:Illustrate manipulation of vocal formants and harmonics in the voice.
Description:Male voices sing various notes while manipulating their vocal tract to obtain emphasis on different harmonics of the fundamental note being sung. This weird phenomenon is known as harmonic singing. You have to hear it to believe it! The recording is by a group known as The Harmonic Choir, under the direction of David Hykes, based in New York City (where else if not LA?).