D Mixolydian

D1E2F♯3G4A5B6C♭7

Major with a flattened seventh: the scale that fits a dominant seventh chord without altering it.

Written out

Fig. 2 · D Mixolydian, ascending

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

DWEWF♯HGWAWBHCWD

D Mixolydian is D, E, F♯, G, A, B and C, and back to D.

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

On the same tonic, D major differs from it by exactly one note.

Across the first twelve frets of the ukulele its notes fall in 32 places, which is what makes a scale a shape rather than a list.

Found by testing every chord in the catalogue against these 7 sounds, not chosen.