Mikey grinned at the mode of address. "Yeah, and I'm Mikey, though you probably already knew that too." Still, it never hurt to be clear on things like names. Definitely helped with avoiding embarrassing situations later on.
He tipped his head curiously to Z's guitar. "Was that something you wrote yourself or something you're learning? It sounded interesting." In fact, he was kind of intrigued as to where Z had learned to play. Hogwarts didn't offer much in the way of arts tuition.