You are certainly under no obligation to try to make your personal statement “match” your activity list, or indeed anything else in your application. I think people sometimes forget that something totally under your control, like the personal statement, is a real opportunity to provide your readers with something new and interesting that they won’t have assumed from the other parts of your application. So this is one of the reasons why things like feel good stories from your activities are not usually highly rated personal statement topics–your readers will have assumed you have such stories, so you kinda missed an opportunity to do something that would actually add new value to your application.
That being said, if you do want to write a personal statement that involves music, feel free. Just try to think in terms of how you can use it to introduce your readers to something interesting about you that would not typically be assumed about someone with a lot of music activities.