I would imagine for the right amount of Euros, he might be able to write out the arrangement completely as a sheet music score. I don’t know whether his arrangements start out as a notated score, or whether he does it all from his head (head arrangement). People with absolute pitch can use the latter method much easier than the rest of us. Some noteurs actually can’t read conventional sheet music. It all depends.

His previous video shows how he makes them. kzfaq.info/get/bejne/nbpghrRe3aisg6M.html

Merci Philippe. La mienne date de 1996! Deux interprétations différentes d'un morceau légendaire.