piano scale
D diminished (half–whole)
D1E♭♭2F♭3F♯3G♯♯4A5B6C♭7
The same eight notes started a half step earlier: the scale that spells a dominant seventh with a flat ninth and a sharp ninth at once.
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
DHE♭WFHF♯WG♯HAWBHCWD
What is true of it
D diminished (half–whole) is D, E♭, F, F♯, G♯, A, B and C, and back to D.
Its steps are H – W – H – W – H – W – H – W, where W is a whole step and H a half.
Chords made only of these notes
CdimdiminishedDmajorDmminorDdimdiminishedD7dominant seventhDm7minor seventhDm7♭5half-diminished seventhE♭dimdiminished
Found by testing every chord in the catalogue against these 8 sounds, not chosen.
Other scales on D
D whole tonesymmetricD diminished (whole–half)symmetricD majormajorD natural minorminorD harmonic minorminor
C dim H-WC♯ dim H-WD♭ dim H-WD♯ dim H-WE♭ dim H-WE dim H-WF dim H-WF♯ dim H-Wall 374