The idea is good. It follows the theme perfectly.
For a game jam, the game feels very well made.
Personally, it doesn't speak to me; getting to the relay and figuring out which instrument is wrong doesn't bring any fun or satisfaction. I could see the concept shine more if it were to become a multiplayer game with people having different instruments/visuals in front of them and trying to figure out, through chat alone, what is correct or not.