The Mutopia Project offers sheet music editions of classical music for free download. These are based on editions in the public domain, and include works by Bach, Beethoven, Chopin, Handel, Mozart, and many others. A team of volunteers are involved in typesetting the music by computer using the LilyPond software.
A growing number of modern editions, arrangements and new music are also available for download. The respective editors, arrangers and composers have chosen to make these works freely available.