I also bought Trombone Champ on the sale! Have not started yet, as I am devoting my attention to a few other games right now and I prefer not to split my game brain toooo many different ways, but excited to as a former band kid who has never played a trombone in real life.
Now that I think of it I feel it was probably the perfect instrument to make this game for. It has Actual Music written for it, as a legit instrument some people devote themselves to and get good at, so there's definitely enough depth to make a game out of it, but it is also one of the instruments more likely to be funny.