International Music Score Library Project

"The International Music Score Library Project, a Web site founded five years ago by a conservatory student, then 19 years old, has made a vast expanse of musical treasures available for free. This public domain repertory of classical music includes Beethoven piano sonatas, Schubert songs, Mozart symphonies, and much more: by simply following the example of Google Books and Project Gutenberg it has grown to be one of the largest sources of scores anywhere. "

http://www.communia-project.eu/content/international-music-score-library-project-humanity%E2%80%99s-musical-treasures-freely-available


http://imslp.org/