International Music Score Library Project (IMSLP) Portal. Piano Society - Free Classical Recordings. Piano Society is proud to present its large collection of more than 5,000 high-quality classical keyboard recordings, produced by our artists consisting of both professionals and skilled amateurs.
Visitors can find a wide range of music by famous as well as lesser-known classical composers. Although all recordings are free, donations will be gratefully received to cover the costs of hardware and web hosting. Piano Society actually consists of two sites. One is the main site, which you are looking at now and contains the music pages with recordings.
It is not necessary to register for the main site, everything is free. Petrucci Music Library: Free Public Domain Sheet Music.