Free Guitar Backing Tracks

Huey Lewis And The News - I Want A New Drug and many more

can be downloaded as mp3 and run through, e.g., amazing slow downer or audacity or whatever



there are some other sites:



Nail guitar has some tabs and a subset have backing tracks.  I haven't checked out many but they seem fine.  I need to get some Oasis tunes into the playlist :-)



Go Play Along has a full featured free version that restricts you to a library of 3 songs, $20 for the real thing.



Riffstation

I have not done anything with this, looks like there are a handful of interesting tools but I can only say that it exists, no review yet...



I do use Rocksmith  frequently.  The user supported tracks are way cool although quality varies...