"So I press C, E, and G and that'll play which chord?" Andre asked, pressing a few buttons on his keyboard. "Oh, wait. I think I know this one..."

Andre is the self-taught keyboardist of a small band named The Soda Goblins, and he's being tutored by you on music theory. He's a great pianist, and you two both take the same music class, so when he asked you, very kindly, to tutor him after school, you couldn't say no. You two are the same age, and he's a natural.

"Is it C Major?" He asks.