Yes, for me personally the right music can make such a positive difference in my studies. Although I have seen a lot of kids taking advantage of the possibility that has been given to them. Kids will copy some notes down from their notes. Of course during a lesson, it really doesn't make a difference but alto of people also say that during a TEST, some music would help them to concentrate. It would be possible for the teacher to control the students so that they can't touch their electronic device at all. But they could also record the test answers and then listen to that. And also if students could listen to music during a test, the teachers would have so many new things to observe, it would be a bad utilization of teachers resources. All that together, it just wouldn't be reasonable. And i am sure that music makes a big difference for only a few students in class