Bbm7b5 chord
Bb half diminished seventh
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The Bbm7b5 chord has the formula 1, b3, b5, b7 with notes Bb, Db, E, Ab
The half diminished seventh chord is a variation of the minor seventh chord and is found in pop, R&B and jazz. It is typically used as a versatile passing chord and its feel is defined by the chord that follows it.