SyncopatedProgress | Impromptu – Jazz manouche lesson @SyncopatedProgress | Uploaded January 2016 | Updated October 2024, 5 days ago.
"...a refinement of Dizzy's proto-bop tune 'Be Bop' from the mid-1940s and one of Django's most exciting songs ever. It was both old and new, a modernistique bebop rendition of 'Les yeux noirs.'" – Michael Dregni

The sheet music I scribbled down:
imgur.com/UqtC4c6

The chords can be found here: djangopedia.com/wiki/index.php?title=Impromptu