C major blues

C1D2E♭♭3E3G5A6

Major pentatonic with a flattened third added next to the third — the two live side by side rather than replacing each other.

Written out

Fig. 2 · C major blues, ascending

Every accidental is written in, rather than left to a key signature, so the letters can be read one at a time.

CWDHE♭HEW+HGWAW+HC

C major blues is C, D, E♭, E, G and A, and back to C.

Its steps are W – H – H – W+H – W – W+H, where W is a whole step and H a half.

Across the first twelve frets of the ukulele its notes fall in 28 places, which is what makes a scale a shape rather than a list.

Found by testing every chord in the catalogue against these 6 sounds, not chosen.