The traditional minor pentatonic scale heard in jazz contains these scale tones:
1 ♭3 4 5 ♭7. For example, in
Cmin, this would be
C E♭ F G B♭.
By contrast, the major pentatonic scale has these scale tones:
1 2 3 5 6. For example, in
Cmaj, this would be
C D E G A.
There is another minor pentatonic scale I've heard used in jazz solos. It has the same scale tones as the major pentatonic, but it uses the flat third. Here's that alternate minor pentatonic scale:
1 2 ♭3 5 6. For example, in
Cmin, this would be:
C D E♭ G A.
This alternate minor pentatonic scale sounds great over
Aø7, and those are the two contexts in which I've primarily heard it used. I would also expect it to sound good over
My question is: does this scale have any theoretical basis? If so, what is its name, and does it have any function outside of jazz / outside of the applications I've described above? If it has no other function outside of jazz, then when analyzed from a theoretical standpoint, is it nothing more than a minor pentatonic scale (
1 ♭3 4 5 ♭7) with a flat fifth (
1 ♭3 4 ♭5 ♭7)? If constructed this way (from a minor scale but with a flat fifth), then the second mode would give the minor pentatonic scale described above (
1 2 ♭3 5 6).
Note: with a little researching, I found the scale referred to as the "half-diminished pentatonic" (see p. 1 of this doc and p. 1 of this doc), but I've also seen it referred to as "Dorian Pentatonic, Kumoi Japan" (see p. 1 of this doc).