Andrew D. Gordon has created 30: 12bar blues play-a-long backing tracks in various Blues styles, keys and tempos such as: Funky Blues, Boogie Blues, Jazz Blues, Minor Blues, Country Blues, Latin Blues, Old Time Jazz Blues, Jazz Swing Blues, Classic Blues Rock, Soulful Blues, Slow Blues and many more. Each of the 30 play-a-long tracks has been recorded with 12 choruses of the 12 bar blues progressi…