Just tell him politely without worrying about too many things. If you want to be elegant and polite, it will definitely not serve the purpose of expressing your dissatisfaction. If you want to express your dissatisfaction, If you are dissatisfied, just tell him directly that you disagree with his behavior of playing music outside. There is really no need to care about elegance and politeness just because of someone.

In fact, there are many small frictions like this in our daily lives, especially in university dormitories. Of course, everyone comes from all over the world, and it is not easy to get together. It is not easy to live under the same roof, but some of our living habits or behaviors are definitely different, and may even cause some unnecessary troubles. I think at this time, as long as others do something wrong, Moreover, their bad behavior has already violated their own interests, so there is no need to care about politeness or elegance. You can just tell them concisely and directly. Taking so much into consideration will not reach you. The effect you want in your heart.

When we first lived together, we had some minor conflicts because of these issues. But at this time, we need a middleman who is not worried about offending others to come forward and talk about the existing problems. This middleman must be Unelegant, because those elegant and polite people in our dormitory are generally very tolerant no matter what happens. Even if they encounter this kind of thing, they usually won't care about it. At most, they will treat it as nothing. Turn a blind eye.

So, this is why I say that if you want to be elegant and polite, it won't solve the problem.

If you really can't stand it, then tell him. Anyway, whenever it infringes on your own interests, you should speak up and tell him what he did wrong.