Everyone in Charlie Bone watches "High School Musical" and they all hate it. Except for Joshua Tilpin, that is. Zac Efron finds out that all the kids hate "High School Musical" and he gets mad and he puts a curse on the city of Freadwardbobertmc'hammerhimesmitopolis making it so that EVERYONE has to sing and stuff like that.
So now, everyone's forced to sing whenever someone says the word "musical." Even the Bloors do several huge musical numbers. Finally, Charlie recruits Jacquel and she puts an end to the spell. And the random singing.