All of us are different when it comes to study habits as well as class schedules. Some of us need absolute quiet to concetrate on our studies. But some of us need to listen to music or have background noise in order to focus. Some of us are very productive in the morning which is why we schedule early classes. And also some of us are very productive in the afternoon or at night which is why we schedule later classes. In my case, I need music to focus and am more producitve at night. Hence, I am actually listening to music as I write this article at 2am.