I am late to this, but if interested I would definitely send letter of interest to music admissions and the music prof. directly.
I am just joining this board, I have a junior in high school considering musical paths. But I also have a music major junior in college, I milled around here a bit back in the day (wow, I hate the new format!).
Long story short, he was wait listed at a school where the prof clearly was very interested in him. He indicated in not so many words in their sample lesson they didn’t have funding for undergrad in his area for the follow fall. They continued contact very regularly through the wait list period. Based on communications, had my kid followed through with indication he’d definitely attend if admitted I think he would have been offered a spot.
I think a lot of schools are trying to evaluate who is a good fit and who will really attend through their processes among musicianship, etc. You really don’t know why you end up wait listed somewhere. So I’d definitely follow through, especially if the math looks good on attendance (big fan of affordable undergrad for music students, that will be a big factor for us).