Today's countertenors possess vocal ranges similar to the mezzo-soprano, and are trained to sing with a vibrant, focused tone. Little research has been conducted on the registers of the countertenor voice. Advancement in vocal techniques in the countertenor voice from the late 20th century to the present has been rapid. This treatise attempts to define the registers of the countertenor voice, and is intended as a resource for singers and teachers. The voices of eleven North American countertenors were recorded and analyzed using VoceVista Pro software, which was developed and designed by Donald Miller. Through spectrographic and electroglottographic analysis, the registers of the countertenor voice were identified and outlined.
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