Again, it depends on the level. Maybe you took trivial CS courses. Many parts of CS are indistinguishable from mathematics, is that so easy as well? What about the various open problems that have remained unsolved for decades now in theoretical CS? You think these are simpler than music? Really?

Come on, at which level did you study them? I studied both at University level and was a classical clarinet player and anything STEM was much more difficult than anything music theory.