My brother and his GF like to duet music that is playing, and it doesn't matter what it is (Scrubs intro for example). So when they do that, I do this..
Me: Hey, who sings this song?
Them: Input bands name here.
Me: Yeah, lets keep it that way.
If he doesn't sing, just break his jaw, and all his limbs so he can't tap or make noise.
SheepStar