Can we make a program that could: work the physical instrument, react in milliseconds to other players, create new work off input it's never heard before, react to things in the room, and do a myriad of other things a performer does on stage in real time? Not even remotely close. THAT is what would be required to call it AGI – thinking (ALL the thinking) on par with a highly trained human. Pretending anything else is AGI is nonsense.
Is it impressive? sure. Frighteningly so even. But it's not AGI and the claims that it is are pure huckersterism. They just round the term down to whatever the hell is convenient for the pitch.