guitar scale
C♯ harmonic major
Major with a flattened sixth: the mirror of harmonic minor, and the reason a major key can borrow a minor subdominant.
The same sounds spelled from the other side are D♭ harmonic major.
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
What is true of it
C♯ harmonic major is C♯, D♯, E♯, F♯, G♯, A and B♯, and back to C♯.
Its steps are W – W – H – W – H – W+H – H, where W is a whole step and H a half.
It costs 6 alterations to write — near the limit of what a key signature can carry.
On the same tonic, C♯ 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.
Other scales on C♯
C harm majD harm majD♯ harm majE♭ harm majE harm majF harm majF♯ harm majG♭ harm majall 374