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

Chord Progression:
| G7 | C7 | G7 | G7 |
| C7 | C7 | G7 | G7 |
| D7 | C7 | G7 | D7 |

Some scales you can use:

G major pentatonic
G minor pentatonic
G mixolydian
G dorian
C lydian b7 (only over C7 chord)
D altered scale (only over D7 chord)

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