And then he will spend the entirety of class ... in a corner as far away from everyone as he can be.

The hell he will! Acting like that in Band is a good way to get Brook's immediate attention, and once that happens your only options are letting yourself get dragged into participating or jumping out the window. And honestly, even jumping out the window might not save you.

He'll get this kid caught up on the basics in no time, thank you very much. |D