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