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A great Slow Blues Backing Track in Ab for Free Improvisation!

Chord Progression:
| Ab7 | Db7 | Ab7 | Ab7 |
| Db7 | Db7 | Ab7 | Ab7 |
| Eb7 | Db7 | Ab7 | Eb7 |

Some scales you can use:

Ab major pentatonic
Ab minor pentatonic
Ab mixolydian
Ab dorian
Db lydian b7 (only over Db7 chord)
Eb altered scale (only over Eb7 chord)

Find much more Guitar Backing Tracks at http://yourbackingtracks.com