Dark infography - Music - Amazing how simple charts can become so complicated. The reason for all the bendiness, color categorizations and legends is to make it look cool. Most of the time, simple is better.
Balloon Popping meter: as the children sing well, a leader pulls on the ribbon from behind. If the kids have mastered a song, the balloon makes it to the top, where it is popped. If all the songs are mastered, the kids get tootsie "pops.