piano scale
C♯ diminished (whole–half)
C♯1D♯2E♭3F♯4G♭5A♭6A♯6B♯7
Eight notes alternating whole step and half step. Symmetrical, so it repeats every minor third.
The same sounds spelled from the other side are D♭ diminished (whole–half).
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
C♯WD♯HEWF♯HGWAHA♯WB♯HC♯
What is true of it
C♯ diminished (whole–half) is C♯, D♯, E, F♯, G, A, A♯ and B♯, and back to C♯.
Its steps are W – H – W – H – W – H – W – H, where W is a whole step and H a half.
Chords made only of these notes
C♯dimdiminishedD♯majorD♯mminorD♯dimdiminishedD♯7dominant seventhD♯m7minor seventhD♯m7♭5half-diminished seventhEdimdiminished
Found by testing every chord in the catalogue against these 8 sounds, not chosen.
Other scales on C♯
C♯ whole tonesymmetricC♯ diminished (half–whole)symmetricC♯ majormajorC♯ natural minorminorC♯ harmonic minorminor
C dim W-HD dim W-HD♯ dim W-HE♭ dim W-HE dim W-HF dim W-HF♯ dim W-HG♭ dim W-Hall 374