D♭ Lydian

D♭1E♭2F3G♯4A♭5B♭6C7

Major with a raised fourth. The fourth mode of the major scale.

The same sounds spelled from the other side are C♯ Lydian.

Written out

Fig. 2 · Db Lydian, ascending

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

D♭WE♭WFWGHA♭WB♭WCHD♭

D♭ Lydian is D♭, E♭, F, G, A♭, B♭ and C, and back to D♭.

Its steps are W – W – W – H – W – W – H, 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 30 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.