Yes. It's utterly pointless to set these distinctions. Iggy and the Stooges and the Ramones were disciplined conceptual artists, yet they were part of a movement that spelled stupid "stoopid". The beautiful thing about real art, the kind that gets remembered as great art later, is that it is always ahead of the theoretical game.

A famous example is Shakespeare, who was vulgar until the German Romantics discovered him as classic.