Furthermore, no matter what your major is, playing the piano well is directly related to further studies and employment in the future.
Third, if you don't want to change your major and learn it well, you can apply directly to your major when you take the postgraduate entrance examination. Of course, your own major must be very good.
You can apply for four juniors, just fill in that you are a senior. . I tried to take an exam once in my junior year, which was helpful for the difficulty of the paper and the exam in the second year.
I hope my answer will have an effect on you.