So for the 4 credit hour class, you are in class 4 hours a week, right? That's the way it worked for the most part where I went to school, but music was different. We had so many classes we had to take (like the pedagogy classes for each instrument group) that they reduced the credit you got for each one to only 1 credit hour, though you were in class for 3 hours a week. The exception were the courses that weren't major specific, like "World music" which was considered a humanity and a writing course and a global credit, so a LOT of non-majors took that class. If filled so many of their requirements with only one class, so it was really popular, and it was worth 3 credits. But things like choruses were only worth 1 credit, even though I had the one 5 hours a week, and the other two groups 3 hours a week and then opera/music theater and chamber choir were 2- 3 hours a week as well. Convocation was a zero credit class but was required every semester to graduate. So we'd have 13-15 classes just to be considered full-time, and we were in class all day, every day. A lot of people didn't think it was possible to have so many classes since most students had 3-4 classes per semester, but music was its own different animal.