( What instruments do you headcanon Dante being able to play? )
Well it’s canon that he can play guitar, and that he can riff pretty hard on it, this is further supported by his ownership of a guitar and amp in his office. But at the same time that COULD be the Devil Arm sounding sick for him.
It’s just as canon that he owns a drum set that he keeps at the office too, and while it’d be such a gag that he’s bad at them, I don’t think so.
So the instruments that my Dante knows how to play (in order of skill):-Drums-Guitar-Bass Guitar-Piano
I think the piano was his baseline thing and that he and Vergil both know how to play them (because they seemed well-off before the demon attack and that just is such a rich kid instrument to be able to play) which informs his ability in other instruments.
Despite being on the run Dante definitely learned these other instruments in his teens, as being rock and roll/in a band was probably a shortsighted attempt to get chicks, which as we know based off of canon doesn’t really work out for him. Sincerely I believe he’s got an innate talent for drums that he does practice and work with, and that when he fights he keeps rhythm when hitting the demons, which lets him keep to combos so uniformly.
To him different weapons have a rhythm, which he establishes during his little play around shows with different devil arms, so that he’s able to execute the same combos more or less flawlessly/without deviation over years and years.