Urological Sciences Research Foundation: Castrati Singers of Italy 
Article about the use of castrated male singers for singing alto in church choirs during 17th and 18th century Italy. RealAudio sample from Allessandro Moreschi. The life story of Carlo Broschi, known as Farinelli.
http://www.usrf.org/news/010308-castrati.htmlCastrati and Countertenors
Chat and forums for people who love the high male voice.
http://groups.yahoo.com/group/castratiandcountertenors/
All You Would Want To Know About the Castrati
Includes FAQ, pictures and biographies, bibliography, and links.
http://www.velluti.org/index.htm
The Male Soprano Page
Information and discography on modern singers reviving the lost art of the castrati; includes bibliography, biographies for current and past adult male sopranos.
http://www.tp4.rub.de/~ak/disc/
