It was bloody rocking out without even any instruments between them. Sirius had, actually, seen Remus do his...music thing in their room at school, when no one else was in the room. And Sirius had heard the muggle music and not just barged in. It had been on instinct more than anything else. But it meant he had seen it. But the thoughts that were plaguing him now - since he knew Remus liked some bloke, which made it completely wrong to act on - were nothing of the sort they had been then.
"Hmm, guitar or drums, I can't decide," Sirius tried to give it some more thought, glad when Remus finally got off his knees. "Nothing ridiculous?" Sirius looked over at Moony appalled, "Where's the fun in that?"