CadenzaD ninth, suspended fourth
D9sus4
Also written D11 · D9sus · C/D
Often written D11, or C/D: a C major triad over the root. The modern dominant — V of G major without the pull of a 3rd. Herbie Hancock's “Maiden Voyage” is built from chords like this one.
How pianists voice D9sus4
The same notes, laid out the way hands actually play them.
C over D Slash chord
1 · ♭7 · 9 · 4 — a C major triad in the right hand over D in the left. The triad brings ♭7, 9 and 11; the missing 3rd is what makes the chord float.
Am7 over D Slash chord
1 · 5 · ♭7 · 9 · 4 — the same chord heard another way: a minor 7th on the 5th, with the root underneath.
Ninth, suspended fourth chords in every key
Every D chord
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