Bb7b5 chord
Bb dominant seventh flat five
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Play Bb7b5 on ukulele at frets 1-2-0-1 in gCEA tuning.
The Bb7b5 chord has the formula 1, 3, b5, b7 with notes Bb, D, E, Ab
The seventh flat five chord is a variation of the dominant seventh chord. It is sometimes used as a passing chord in jazz tunes to resolve at a major or minor seventh chord one half-step down.