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Note that they already have a lot of music available: http://www.musopen.com/music.php

Since the founder is reading this thread, I'll ask here: why do you require people to log in before downloading anything?

Because too many have abused the site with bots and automated scripts. It has literally taken down the site more times than I care to remember.

We also have to keep track of things like who is uploading what for DMCA protection.

I just listened to a piece I like (a Chopin polonaise) and the quality isn't great.

This is a great idea though, and I hope the money helps them make many great recordings in the future.