D whole tone

D1E2F♯3G♯♯4A♯♯5B♯♯6

Six notes, every step a whole one. There are only two of these scales in all, and every note can be heard as the tonic.

Written out

Fig. 2 · D whole tone, ascending

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

DWEWF♯WG♯WA♯WB♯WD

D whole tone is D, E, F♯, G♯, A♯ and B♯, and back to D.

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

Across the first twelve frets of the guitar its notes fall in 39 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.