Choral Public Domain Library
Begun in December 1998, CPDL is one of the world's largest free sheet music sites.You can use CPDL to find scores, texts, translations, and information about composers.
Opera Karaoke: Classical singer virtual coach
Welcome to Opera Karaoke, the site in which classical singers or aspiring ones can find at their disposal, ready to be downloaded, all the tools necessary to perfectly learn the most famous arias of the operatic repertoire.