Wow. Not at all sure what to make of this! Unrepentantly stolen from Neatorama...
According to Robert Dawson Scott in "The man with the 300-year-old voice":
[Maniaci] does not sing falsetto, nor does he have a baritone register, as counter-tenors do. On the other hand, he is whole and male (he obviously shaves; he assures me he is fertile). It is just that some quirk in his development led to all the appurtenances of puberty appearing except one – his larynx did not grow along with the rest of him. As a consequence, his voice never broke.
. . .
He may be the only man on the planet who can sing [the role of Atis in Reinhart Keiser's 1711 opera The Fortunes of King Croesus] at pitch, which goes up to a B natural, two octaves above middle C.
Maniaci’s speaking voice is light and high, but, because he is an adult with a stocky frame, it is oddly resonant, like a rather fruity maiden aunt. His singing voice probably comes close to those castrati voices of long ago – although with only one antique recording available we can only really guess.