Muggle stuff was weird. There was no other word for it.. no other way to imagine it.. given that, Regulus regarded his surroundings with natural apprehension and tried not to wonder what sorts of things all those snakey contraptions might be doing or what the damned equipment was for. Instead, he avoided touching much of anything and stayed close on his brother's heels, though he had every wish to turn around and talk to Remus about the music.
"Tchaikovsky?" he questioned, his mind running around in circles to pick up the name and what it was associated with. Regulus' music instructor was classically trained and therefore so was Regulus. And yes, muggle classics had been part of the curriculum... but nobody told his mother that. Ever.
"I've heard some of his pieces on the ballet, Swan Lake.. But I've never been to a ballet, maybe next time we could go to that," he said confidently, looking over his shoulder to give Remus a suggestive look with that terrible grin and spinning back around to grab at Sirius' arm and step up closer to him.