How to Play Piano Chord: B♭ half-diminished 13 — root

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B♭m13♭5

root position

B♭ half-diminished 13

root position

B♭, D♭, E, 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

A♭ major A♯ · G♯

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

a major triad a whole step down from the root
C major A♯ · G♯

C–E–G = 9, ♭5, 13 · left hand: root + ♭7

a major triad a whole step up from the root

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