try these:

[wikifonia.com](http://www.wikifonia.com) 

[Musescore.com](http://www.musescore.com/sheetmusic "Makers of open the free open source WYSIWYG score editor "Musescore""): the community site of the free open source WYSIWYG score editor "Musescore" has a decent selection -over 10,000 pieces-, and they are all available as a Musescore format file (meaning you can edit every tiny bit of the score to your liking), besides for .PDF, .Xml, .Midi and usually a .Mp3 format.