B7♭9 arpeggio & chord for gypsy jazz
The B7♭9 arpeggio is built from the notes B (R), E♭ (3), F# (5), A (♭7), C (♭2). On Haute Gitanerie you can see it across the whole guitar neck — contained position boxes, long diagonal forms, and its parent scale (B Phrygian dominant) — with note names in English (C D E) or solfège (Do Ré Mi).
The B7♭9 chord
The B7♭9 chord voicing uses those same notes (B (R), E♭ (3), F# (5), A (♭7), C (♭2)). Switch the fretboard to Chords to see gypsy-jazz voicings for B7♭9, or keep Arpeggio to practise the tones one at a time — same shape, two ways to hear it.
How to practise the B7♭9 arpeggio
Start with a contained position box near the low strings, then move it up the neck fret by fret, or follow a diagonal form for a two-octave sweep in the manouche style. Every note is labelled with its interval (R, 3, 5, ♭7, ♭2), so you always know where the root, third, fifth sit.