John smiled slightly at the invitation, but glanced around the room and moved to pick up a dark colored acoustic guitar sitting nearby on a stand. He took the invitation to play as an open one, and was pleased to find the instrument tuned ad he leaned against the arm of another chair and strummed. "Doesn't have to be anything specific. Sometimes you just hear a classic Gibson playing and can't help but check it out."
He'd always been impulsive, and despite working to control the urges as an adult, his new family had been working on loosening him up again. When he'd first met Pam he probably wouldn't have come into a dark studio he wasn't familiar with, chasing a few notes on the wind. He probably would have left as soon as he recognized another nonhuman creature with powers he didn't understand yet, who wasn't a friend. He would have been cautious and felt it more important to avoid trouble than satisfy his curiosity.
Of course, if his turning had taught him anything, it was that certain beings were just going to get what they wanted, no matter how you fought. The same impulse that had lead him to try blowing his own brains out had been what impressed his new creator, and that was a lesson that overrode even years of military and religious service. He might have sought out institutions with strict expectations and structure, but the impulse to throw caution to the wind when it suited him had only ever been mitigated.
"Since I was a kid. My parents thought an interest in music would help keep me out of trouble," he chuckled, starting a slow, melodic pattern over the strings. It was more or less a response to Eric's meddling, he didn't have anything specific in his mind. "Worked for a few years, kind of. But the music always stayed with me, whether or not I was misbehaving."