#2
Try here:
http://www.guitarbackingtrack.com/

And here:
http://www.karaoke-version.com/guitar-backing-track/

Neither are free, but there are some excellent quality tracks on them.

You have to be a bit selective with the first link, they're user submitted tracks so some are better than others. The main advantage though is you can play the whole backing track free so long as you don't want to download & remix it.

The second site seems to be all really good quality (for the tracks I've tried at least), but you only get a sample of the song for free. I haven't actually purchased anything from there (yet), but it appears that purchasing gives you access to the whole song even though you still have to use the webpage to set the levels of each track. You don't appear to be able to download the unmixed tracks so you could import them into your DAW.
Gibson LP Traditional, LP GT, LP Studio, SG Standard x2
Barber Tone Press > EHX Worm >TC Polytune > MXR Custom Badass 78 > EXH Glove > EHX East River Drive > Zoom G3 > TC Spark Mini Booster
Laney VC30
Marshall TSL602
Jet City JCA22H
.
My SoundCloud
#4
Gibson LP Traditional, LP GT, LP Studio, SG Standard x2
Barber Tone Press > EHX Worm >TC Polytune > MXR Custom Badass 78 > EXH Glove > EHX East River Drive > Zoom G3 > TC Spark Mini Booster
Laney VC30
Marshall TSL602
Jet City JCA22H
.
My SoundCloud