International Music Score Library Project (IMSLP)

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International Music Score Library Project (IMSLP). 2007-.
http://www.imslp.org/wiki/Main_Page

Available again after a period of downtime, this public domain score library wiki has approximately 4000 files. Entries are user submitted with some scores from composers that wish to share their music free of charge. You can browse by composer’s name, time period, work’s genre, as well as search.