This recording is over 10 minutes long and contains 12 blues choruses. With these pro backing blues tracks, you can learn how to play the trombone blues. The play along blues jam tracks for trombone, will help you develop a feel the blues changes over time.  The chords for the trombone pro blues track are:
In the 12 Bar Blues, the 1 Chord is ‘D Chord’ - Notes D, F#, A
In the 12 Bar Blues, the 4 Chord is ‘G Chord’ - Notes G, B, D
In the 12 Bar Blues, the 5 Chord is ‘A Chord’ - Notes A, C#, E
Some MAGIC notes to play around with are B, D, E