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