CadenzaD♭ ninth, suspended fourth
D♭9sus4
Also written C♯9sus4 · D♭11 · D♭9sus · B/D♭
C♭ is the key you know as B.
Often written D♭11, or B/D♭: a B 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 D♭9sus4
The same notes, laid out the way hands actually play them.
B over D♭ Slash chord
1 · ♭7 · 9 · 4 — a B 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.
A♭m7 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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