Check out guitarbackingtrack.com
Lots of jam tracks and many backing tracks with vocals etc.
Jammit | The Ultimate Music Platform
You can jam with the original artist. Rush, in your case.
You are provided with the isolated tracks of various instruments and given the tab & staff music.
These can't be free, can they? I checked the sight out and it's just what I'm looking for, but can't figure out how you buy the tracks.