Back tracks for whole songs

Is there a place to get good mp3 backing tracks for entire songs? I see people performing by themselves all the time with great tracks. I have seen some karaoke type but not to good of quality.I want to be able to sing and play lead along with tracks.

http://www.guitarbackingtrack.com/

Rock on!

Thanks Chris,
I downloaded a few. Now to learn the leads and tune up the voice.

Just tried to download a Skynyrd track and got a popup called angels revenge beware.