C altered

C1D♭♭2E♭♭3F♭♭4G♭♭5A♭♭6B♭♭7

The seventh mode of melodic minor. Every degree above the tonic that can be altered, is.

Written out

Fig. 2 · C altered, ascending

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

CHD♭WE♭HF♭WG♭WA♭WB♭WC

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

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