If you get into any of these schools, you will do fine 
My daughter loved Harvard. She is a composer and classical guitarist and continued with a private teacher for guitar. Grad school is more than possible for students who continue training both within and outside of Harvard-or any of these schools.
You may be overthinking this. it won’t be long before you hear where you are accepted. At that point, do full research on the schools that admitted you, online and on campus. There will be differences between schools that are both obvious and nuanced. (For instance, Brown’s music major has three strands, composition/theory, ethnomusicology and technology.)
Since all the schools on your list are fantastic for what you apparently want, I think you may just be jumping the gun a bit because it’s hard to wait. I’m like that too
You may end up with a few schools to look into, or all of them, but in the end you really cannot go wrong.