Students have limited time. They can't go to all classes for all subjects. There's a compromise between how much time one can allot to music, math, sports, etc.
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TakaBut it's not the students here, but the teachers that face the competing demands, right?Both, of course. But your text talks indeed about teachers.
TakaThen, why do you think it not teachers in general, but specifically music teachers?You could make the argument about all teachers, but the author has chosen the music and the music teachers as a focus.