Digitized Sheet Music
Gutenberg Music
Project Gutenberg volunteers have been engaging in digitizing public domain sheet music, using a variety of techniques, to enable study and performance. For the most part, the musical pieces created have been chamber music, with composers such as Brahms and Beethoven.
Mutopia Project
Free Sheet Music for Everyone
2100 pieces of music – free to download, modify, print, copy, distribute, perform, and record – all in the Public Domain or under Creative Commons licenses, in PDF, MIDI, and editable LilyPond file formats.