That depends on the college station. some are operated as "electronic sandboxes", others tend to be more "prfoessioanl"...when I was GM (professional - not student) at a University station. No outside music was allowed to be brought in to to the station. Shows were programmed. In the case of our "Jack" program, it was an eclectic mix of music and helped generate seven NAB Marconi nominations. Our "Jack" format was to educate listeners music by introducing them to the music and artists. Live announcers complimented the program.