Short answer: B7b9 is a B 7♭9 chord containing the notes B, D♯, F♯, A, C. It has 4 inversions. Use the diagrams below to learn each voicing on the keyboard.
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Notes: B, D♯, F♯, A, C
Notes: D♯, F♯, A, B, C
Notes: F♯, A, B, C, D♯
Notes: A, B, C, D♯, F♯
B7b9 is a B 7♭9 chord. It contains the notes B, D♯, F♯, A, C. On piano, play these notes simultaneously to sound the chord.
To play B7b9 on piano, press the keys B, D♯, F♯, A, C together. The root position uses these exact notes. There are 4 inversions available, each rearranging the same notes in a different order.
The B7b9 chord contains the notes: B, D♯, F♯, A, C.
B7b9 has 4 inversions. Each inversion rearranges the notes so a different note is at the bottom. The root position starts with the root note, the first inversion moves it to the top, and so on.