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Bb Altered Chord: Bb7alt (Also: Bb7altered, Bbalt, Bbaltered, Bb7#9#5, Bb7#5#9, Bb7b9#9, Bb7#9b9, Bb7#5)

Dominant 7

M3, M3, 2, m3, 2

C, E, G#, Bb, Db, D#