It makes sense. Music is something he enjoys and if his world had a school to learn all different kinds, what could stop him? He's a free man, no longer contained by people who want to experiment on him and able to live his best life.

"I'll find things for you to play on June 19th," Which sounds almost like a threat, but it's musical quid pro quo. Did she, maybe, spoil part of the surprise? A tiny bit. But she wants him to be happy. "Your heart will be warm on your birthday too."