I have used: http://www.classicalarchives.com/
There are some hoops to jump through, vaious membership levels, download limits/day, (all free, once a member), but being a teacher, having access to such a large collection (even if some of it is midi) of music, with the options of emailing selections to my students ( so they could here what is was they were learning to play, or preview a piece to decide if they wanted to learn it), I more than got my money's worth out of this site.
They also have some very hard to find Eastern European Music.
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