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1.
The highest male voice; in speaking and singing, countertenors have the normal range of a tenor, but are able, by singing in falsetto, to go higher, into the contralto/alto range, mezzo-soprano range, and, with the great ones, into the soprano range.

They are usually assigned roles written originally for the castratos, yanking those roles away from the contraltos.
Is that a female alto singing...? It sounds different... it's probably a countertenor.
by Sam October 29, 2004