piano scale
B♭ diminished (whole–half)
B♭1C2D♭♭3E♭4F♭♭5G♭♭6G6A7
Eight notes alternating whole step and half step. Symmetrical, so it repeats every minor third.
The same sounds spelled from the other side are A♯ 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
B♭WCHD♭WE♭HF♭WG♭HGWAHB♭
What is true of it
B♭ diminished (whole–half) is B♭, C, D♭, E♭, F♭, G♭, G and A, and back to B♭.
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
CmajorCmminorCdimdiminishedC7dominant seventhCm7minor seventhCm7♭5half-diminished seventhD♭dimdiminishedE♭major
Found by testing every chord in the catalogue against these 8 sounds, not chosen.
Other scales on B♭
B♭ whole tonesymmetricB♭ diminished (half–whole)symmetricB♭ majormajorB♭ natural minorminorB♭ harmonic minorminor
C dim W-HC♯ dim W-HD♭ dim W-HD dim W-HD♯ dim W-HE♭ dim W-HE dim W-HF dim W-Hall 374