International Music Score Library Project (IMSLP)
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Persistent URL: http://imslp.org/wiki/Main_Page
IMSLP is a project for the creation of a virtual library of public domain music scores, based on the wiki principle, but it is also more than that. Users can exchange musical ideas through the site, submit their own compositions, or listen to other people's composition, which makes it an ever-growing musical community, by the music lovers for the music lovers.
IMSLP attempts to create a virtual library containing all public domain musical scores, as well as scores from composers who are willing to share their music with the world without charge.
IMSLP also encourages the exchange of musical ideas, both in the form of musical works, and in the analysis of existing ones. Therefore, feel free to create/edit a page with your analysis of a particular piece (please use the "Discussion" link on the work page of that particular piece).
The IMSLP collection contains 20,000 music scores as of September 2, 2008.