I did college radio for a bit. You could play whatever you wanted up to a certain extent. At least where I was at, ~'06, you could play like 30? minutes of whatever you wanted, it's been a while might be more or less. The other x minutes of your hour you had to play a selection of music. It was a very wide range of things so you could easily find something to fit into your show but it had to be from the pool that college got.

Maybe other colleges did it differently but we didn't have a program manager or anything. Everyone was free to do what they wanted outside of some FCC rules and what I previously mentioned.