He wasn't really paying attention to the music so much as the conversation and he giggled slightly at her question.

"Ah, that's because when we met he didn't like me calling him a trashy, hack magician, he insists he's a mentalist instead." He grinned and rolled his eyes.

Senku snickered. "He said to call him a mentalist and that just stuck." Partly because Senku was a smartass. It was a nickname, one he said with more affection than most things.