Senior Consultant at Hay Group
That's actually a great question and I'm sure a lot of people struggle with this issue in college. I eventually earned a master's degree in math and then became an actuary, which combines math, economics, finance, and computer skills. However, I started out in college as a music major, thinking I wanted a career in a symphony orchestra.
In my case, I eventually realized that becoming a professional musician took a lot of real hard work and it was super competitive, so I decided to make a change after my second year. I guess what I am saying is that at some point you probably need to decide on which subjects where you will focus most of your efforts. If you are already musically talented, there are many opportunities in most cities to participate in various community bands, orchestras, or singing groups, as I did for several years after college. It was a lot of fun and interestingly, there were a lot of people I met in those groups whose "day jobs'" were scientists, engineers, teachers, lawyers, etc.
Sorry for the long and rambling answer, but I hope it helped. Good luck!