From chatlog because I'm too lazy to type it again:
(9:15:59 PM) me: download the guitar hero 1 pack
(9:16:07 PM) me: activate the 'chilly' mod
(9:16:15 PM) me: and then get more stuff here:
(9:16:19 PM) me: http://songsonfire.co.nr/
(9:16:31 PM) me: also fretsonfire.net has songs in their forums
edit: some of the GH2 songs are kinda buggy to play, there are issues with the rhythm tracks. some are fine, though.