I found this great website called OverClocked ReMix.org who are dedicated to bringing you covers, original homages and remixes to classic video-game soundtracks. You can download any you wish by searching or you can download the entire library through their torrent section.

My favourite has to be the cover of Outride a Crisis from Super Hang-On which I think was in the arcade in Shenmue, but I have the original on the MegaDrive. :P

I have to stress that this is legal. >_>