Case Western and Rochester are popular pre-med choices in my circles because they both combine good related departments with lots of relevant experience opportunities.
In terms of music, you might want to check out this prior thread by a person looking at those two universities with a combination of biology/neuroscience and music interests:
As discussed there, Rochester is interesting because it has a separate School of Music, Eastman, where you can take classes, but also a Department of Music in the main college where you can do a cluster, minor, or major. See this post:
Just to elaborate a bit about Eastman, if you are a regular Rochester student, aka River Campus student, you can, subject to an audition, take what they call secondary lesson classes at Eastman. Here is a short official blog post:
Obviously you have other good options, but to me it feels like Rochester might stand out as a great place to combine pre-med and a love of music. And it is also a great university for other things in case he changes his mind about pre-med, which many do.