IMO your music teacher would probably be a good choice for the personal rec. Unlike the special interest rec, it is more of a character reference, so assuming she holds you in high regard, which from your post it seems she does, she seems like a good option.
I’m getting my personal rec from a teacher I haven’t been in contact with for over a year, so assuming you didn’t stop taking lessons from her 3+ years ago, I wouldn’t worry about that.
When asking her to write it, make sure you come across as mature and grateful, and explain to her why going to BS is important to you. Also, if you’re worried about asking her because you’ve stopped doing piano, make sure you explain to her reasonably and in a well-mannered way why you made that decision. I doubt she is harboring any resentment towards you for changing your priorities, but if that’s something you’re worried about, you can always bring up the idea of her writing it and gauge her response before making your decision. You mentioned that you were ‘one of her best students’, so I’m sure any recommendation she writes you will be favorable. If your worried about asking her because you’ve changed your priorities and don’t want music to be a focal point of your application, I wouldn’t worry. The AOs read 4-5 different recs, numerous essays, and your EC list, so unless you have someone you would much rather ask or you think she will write a bad rec, there is almost no chance that this will hurt your application. If your music teacher is someone who knows you fairly well, and who you’ve taken lessons from over many years, and they have a good opinion of you, I say go for it.
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