If you need the backing tracks for just practice, and you dont care that they are Midi i can recommend something like Powertab or Guitarpro.

if not www.guitarbt.com is pretty good
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for free the above are pretty good but for a very small amount you can get professional backing tracks from http://www.bluesjamtracks.com/

That sounds likle an advert now that I read it over.
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im looking more for sorta of, freestyle stuff, not songs, just loops drum loops and chord progessions. not saying of course that i wont have fun with what you guys have posted! thanks!