[Normally, he is a little on edge with all strangers. This time, he's too busy thinking he's crazy to even consider refusing this simple request.] The music. I looked around, and there are no speakers. The volume doesn't fluctuate no matter where I am and I can't find a single source for it to be coming from.

[That alone would usually freak him out. He's not sure if it's better or worse that other people can hear it as well.

But he seems a fraction calmer when he's focused than when he's not. He's an intellectual, and a verbose one at that. Talking helps him think.]