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B♭7♭5

B♭ 7th Flat 5 · 4 fingerings

Flatten the fifth of a dominant seventh and B♭7♭5 becomes considerably more unstable and modern-sounding. It's a jazz and fusion colour, usually functioning as a substitute dominant on its way to resolution, and it pairs well with whole-tone and altered scale ideas. Uncommon outside of jazz, but striking when it lands.
123
B♭7♭5 · position 1
5fr2341
B♭7♭5 · position 2 · fret 5
8fr1234
B♭7♭5 · position 3 · fret 8
11fr3241
B♭7♭5 · position 4 · fret 11