PP Blues in AFlat
          (one version)
AFlat7DFlat7AFlat7AFlat7
DFlat7DFlat7AFlat7AFlat7
EFlat7DFlat7AFlat7AFlat7
The right hand improvises with notes of the blues scale:
(All the black keys plus C flat and D)
Printed Music

The left hand plays at least the 3rd and 7th of each chord:
Printed Music