I think the key ingredient here is finding out how amenable and supportive of double majors these programs are. Some colleges encourage this…and others don’t discouraged but in reality, it’s difficult to do.
Remember that music majors by design take a bunch of one credit courses that meet 3-5 times a week (lessons, ensembles, chamber groups). And these are not optional courses.
My music major had a very very full schedule of required courses and he placed out of some gen Ed’s because of AP scores. In addition, when you add in the required practice time (don’t under estimate this), it might not be so easy to do a double major. Heck…my second kid wanted to do a music minor along with her engineering major…and she couldn’t even do that.