+ 2 to the Am/C Major Pentatonic
The A minor Pentatonic/C Major Pentatonic [A-C-D-E-G] is a 5 tone scale. Music which is key-based typically uses scales with 7 [heptatonic]. So, let’s add two [using scale starting from the A in a general sense]…
- + Bb and F, we get A-Bb-C-D-E-F-G, which is the key of F Major.
- + B and F natural, we get A-B-C-D-E-F-G, which is the key of C Major.
- + B and F#, we get A-B-C-D-E-F#-G, which is the key of G Major.
One thing this tells us is that Am/C pentatonic works as a scale choice for soloing in F, C, & G, since A-C-D-E-G are common to all of them. On the circle of 5ths, for any 3 adjacent keys, the one in the middle’s m/M pentatonic scale can be used for itself and the key on each side of it.