CadenzaD diminished seventh
D°7
Also written Do7 · Ddim · Ddim7
C♭ is the key you know as B.
Four notes, each a minor 3rd from the next, so D°7 = F°7 = G♯°7 = B°7 — there are only three different diminished 7ths. It is also a 7(♭9) chord with its root left out: C♯7(♭9), E7(♭9), G7(♭9) or B♭7(♭9).
How pianists voice D°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.
D°7 inversions
The same 4 notes with a different one in the bass. Each inversion is written as a slash chord.
Root position D°7
Root at the bottom, stacked in 3rds: 1 · ♭3 · ♭5 · 𝄫7.
1st inversion D°7/F
F (the ♭3) in the bass: ♭3 · ♭5 · 𝄫7 · 1.
2nd inversion D°7/A♭
A♭ (the ♭5) in the bass: ♭5 · 𝄫7 · 1 · ♭3.
3rd inversion D°7/C♭
C♭ (the 𝄫7) in the bass: 𝄫7 · 1 · ♭3 · ♭5.
Diminished seventh chords in every key
Every D chord
Play a chord. See its name.
The free chord finder names whatever you play — on a MIDI keyboard, with your mouse or on your computer keys — with the same engine as Cadenza.
Or let the app follow you.
Cadenza names every chord you play, live, writes what you played as sheet music, and puts the keyboard straight into OBS. The core is free forever.