Chord Naming variations:
A# ninth flat five, A#9b5, A#9(-5), A#9(b5), A#7/9(b5)
Bb ninth flat five, Bb9b5, Bb9(-5), Bb9(b5), Bb7/9(b5)
This chord is a 7/b5 chord (root, major third, flat five, minor seventh) with added a major 9th.
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