"Guitar," he said it as a matter-of-fact. Sirius was a leader of people and drummers were never the frontmen, though who decided that long ago was a mystery. "No, no, no," he began with a shake of his head. Remus was fully embracing this idea of a band, completely as a joke, and was having fun fulfilling the role. "People have to take it seriously! Sirius-ly."
By now his hand was splayed across Sirius' chest, trying to emphasize his points. "A name to roll off the tongue and take everyone by storm - by the way, I'm officially going to be known as Moony. Remus isn't very brilliant, y'know?"