CadenzaA♯ diminished seventh
A♯°7
Also written B♭°7 · A♯o7 · A♯dim · A#dim7
Four notes, each a minor 3rd from the next, so A♯°7 = C♯°7 = E°7 = G°7 — there are only three different diminished 7ths. It is also a 7(♭9) chord with its root left out: A7(♭9), C7(♭9), D♯7(♭9) or F♯7(♭9).
How pianists voice A♯°7
Nobody plays a jazz chord in root position. These are the shapes that actually get played — the same ones Cadenza shows when you play the chord.
Shell Left hand
1 · ♭3 · 𝄫7 — root, 3rd and 7th: the three notes that say what the chord is. Left hand, low; everything else is colour.
Rootless A From the 3rd
♭3 · ♭5 · 𝄫7 · 9 — no root: the bass player has it. The left-hand voicing of modern jazz piano.
Rootless B From the 7th
𝄫7 · 9 · ♭3 · ♭5 — the other half of the pair. A and B alternate through a ii–V–I so the hand barely moves.
Drop 2 Two hands
♭5 · 1 · ♭3 · 𝄫7 — close position with the second voice from the top dropped an octave: wider, warmer, the standard for chord melody.
A♯°7 inversions
The same 4 notes with a different one in the bass. Each inversion is written as a slash chord.
Root position A♯°7
Root at the bottom, stacked in 3rds: 1 · ♭3 · ♭5 · 𝄫7.
1st inversion A♯°7/C♯
C♯ (the ♭3) in the bass: ♭3 · ♭5 · 𝄫7 · 1.
2nd inversion A♯°7/E
E (the ♭5) in the bass: ♭5 · 𝄫7 · 1 · ♭3.
3rd inversion A♯°7/G
G (the 𝄫7) in the bass: 𝄫7 · 1 · ♭3 · ♭5.
Diminished seventh chords in every key
Every A♯ chord
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