ensemble

In the Bobby Bland version the V7 is followed by a bVI7, which is simply the same as the V7 with all of the notes up a half step. The V7 is D F# A C, so this up a half step is Eb G Bb Db. If you think in sharps better, then you get D# F## A# C#. The F## is the same note as G, so it may be easier for you to think D# G A# C#.

The V7 Chord is D F# A C and is found here: 1+ 1 2' 3" 4+ 4 6
The bVI7 chord is Eb G Bb Db and is found here: 1' 2 3' 4' 6+ continue reading...

Yen Ming Chen speaks of the Sirius Harmonica Ensemble and the Chord Harmonica.

Yen Ming Chen - HOHNER Masters of the Harmonica
http://youtu.be/AuNspLIWEMw