guitar scale
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
Every accidental is written in, rather than left to a key signature, so the letters can be read one at a time.
The step pattern
D♭WE♭WFWGHA♭WB♭WCHD♭
What is true of it
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 guitar its notes fall in 43 places, which is what makes a scale a shape rather than a list.
Chords made only of these notes
Found by testing every chord in the catalogue against these 7 sounds, not chosen.