The existence of a calculus class doesn't stop a student from taking music courses or being in the school band. In fact, at the schools I went to/taught at most students that took Calculus were also in the band.
The really interesting question this brings up is, is there some causal relationship between students that study music and their likelihood of taking calculus? (e.g. Assuming we call all kids that take calculus "smart kids", are smart kids more likely to also study music, or does studying music make kids into smart kids) Or, is there just some selection bias where kids from a certain background are more likely to do both?
