Chord & FretA#9sus4 — dominant ninth suspended fourth
Also written Bb9sus4 — the same chord, spelled the other way.
Notes in A#9sus4: A# – D# – E# – G# – B#Formula: 1 – 4 – 5 – b7 – 9In the formula, the numbers count steps of the major scale starting from the note that names the chord; "b" lowers a half step, "#" raises one — and a slash names the bass note.
The 7sus4 with the ninth on top. It is a two-storey chord: a minor triad sitting on a different bass — Gm7Gm7Gm7Gm7 over C — which is why it sounds modern and floating.
The same chord on all four instruments
Where to use it: Neo-soul, gospel and bossa vamps; ideal for holding a section without resolving.
Every region of the neck hides more shapes of A#9sus4. In Chord & Fret, you check it note by note, playing any shape as an arpeggio; compare positions with their difficulty marked; and set a capo — the diagrams redraw above it. Start free. Unlock everything with Pro. Plays offline.
See the whole neck in Chord & Fret →Part of the Suspended family.