Michael Maniaci is the type of voice that is a specific type of what?
Michael Maniaci:  Possessing a male soprano voice, Maniaci is noted for his claim to be able to sing into the upper soprano register without using falsetto, an otherwise common phonation for men who sing in high registers, such as countertenors. Although this was possible for castrati, because of the hormonal imbalance following castration, Maniaci claims that, for some unknown reason, his larynx did not develop and lengthen completely, causing his voice not to "break" in the usual manner. Sopranist:  This voice type is a specific kind of countertenor.
countertenor