My Chances?

Hello! I’m a senior in high school applying to schools like Eastman, Rice, Northwestern, and Indiana!
My Stats:
ACT- 30
GPA- 94% (I’m not sure about the 4 point system, my school does percentages!)
AP courses- AP Comp Sci 3, AP Environmental 4, AP Composition and Literature 4, AP Us History 3

I was wondering how much grades factor into the admissions process for schools such as Rice and Northwestern. I am only applying to their respective music schools, and I’ve heard mixed things! Are those schools heavily audition based like conservatories? Or is the importance of grades and auditions split 50/50? Please let me know, and it would help a lot if you could share personal experiences or link me to other discussions with similar questions