I majored in computer science, with classes in math, physics, linguistics, etc... but also spent about a year majoring in music. In my opinion, the music classes were harder, and I had been playing music since I was 6. It's intense stuff. It really is like a form of applied mathematics, and you have to not only understand it on paper with your eyes, but hear and understand it with your ears.

Mastering the basics is hard enough... being able to apply this knowledge creatively takes it to a whole other level.