How to Play Piano Chord: B♭ dominant 13 sharp 11 — root

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B♭13♯11

root position

B♭ dominant 13 sharp 11

root position

B♭, D, F, A♭, C, E, G

The notes of the A♯ major scale are:

Major scale pattern

The semitone pattern for a major scale is:

WWHWWWH

where:

1, 3, 5, ♭7, 9, ♯11, 13

C major A♯ · G♯

C–E–G = 9, ♯11, 13 · left hand: root + ♭7

a major triad a whole step up from the root
F minor A♯ · G♯

F–G♯–C = 5, ♭7, 9 · left hand: root + ♭7

The keyboard can of every chord — change it any time in Preferences.