The music ball in the multiplayer lobby is the best thing about the whole game!
Got 140 on one of Triforce Heroes' songs. A couple days ago I had a whopping 174 on the Hyrule Castle Theme, but I sadly couldn't save a picture in time... The trick is to get the ball to the carpet with you facing the door. It'll get stuck on the guard or something I guess and it'll only bounce perfectly straight up and fall straight down.