EmusicList.com

Musopen is an archive of professionally-played classical music that is placed in the public domain, and it’s also ramping up its supply of free sheet music. With some help, this could be one of the ‘Net’s coolest music resources.

One of the site's innovative features is its bidding system, in which users can pledge contributions toward specific pieces. When they necessary amount is raised, a professional musician is hired to perform, say, Bach's Goldberg…