A7♭9 arpeggio & chord for gypsy jazz
The A7♭9 arpeggio is built from the notes A (R), C# (3), E (5), G (♭7), B♭ (♭2). On Haute Gitanerie you can see it across the whole guitar neck — contained position boxes, long diagonal forms, and its parent scale (A Phrygian dominant) — with note names in English (C D E) or solfège (Do Ré Mi).
The A7♭9 chord
The A7♭9 chord voicing uses those same notes (A (R), C# (3), E (5), G (♭7), B♭ (♭2)). Switch the fretboard to Chords to see gypsy-jazz voicings for A7♭9, or keep Arpeggio to practise the tones one at a time — same shape, two ways to hear it.
How to practise the A7♭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.