Halfway into the Light

Music majors always have 25+ units per semester. It's because music performance units basically consist of playing an hour a week per unit. It doesn't require out-of-class study or any other sort of work, other than keep playing and don't suck. Your concept of how much time is taken out of your week is very different for classes which require out-of-class reading/study/work compared to music performance :) And even the theory classes and composition classes take very little time.