So, by that logic, the Beatles at about the time Revolver was released... were not musicians. Because, as you may or may not know, with the Revolver album they became a studio-only band. They neither
wanted to play concerts (they were sick of playing concerts, started fearing getting shot, etc.) nor
could they play because of limitations of live performance technologies at that time.
But ignoring the Beatles for a moment, what about totally electronic music that's of a kind that can't be played live in any meaningful way? And what about people like me -- who have absolutely no interest in buying band t-shirts (I prefer wearing plain clothes) or attending live concerts?