• The backing tracks are organized by style of music
• Some of the backing tracks are accompanied by a .txt file which contains chords or notes about the bt.
• You can download them by right-click --> Save As, or stream from the music player below
• The first thing to do is to listen to the track, and figure out which key is the root by playing notes on the gutiar, and picking one that sounds the most resolved
• Then use the scales or modes which sounds right over the music

By popular demand, here is "Santana - Love is You" backing track: