Here is my 2 cents.
This was a big selling point at Lawrence and a good number of students do it. I know a couple who have done their 5 year program and really liked it. It was front and center in recruiting.
At IU, you can do a BM or a BSOF which allows outside study in a chosen field. However it is NOT a dual degree. It is more like a minor. Arts administration and theatre are common outside fields. I just sat through graduation and most undergrad degrees were BM but there were a good number of BSOF too. I think I recall one double degree if I understood the degree announcement correctly. It is NOT promoted at the school. I had to dig a bit for the BSOF information and even with that degree music is front and center in all. Sorority and fraternity activities are also discouraged. You are to be spending your evenings in ensembles and days going to class and practicing. So…listen carefully to what admission people are saying or not saying. If there is not a clear dual degree path and you are getting a “well yea a couple of students have done it and yea if you work hard you can make it happen”, it may not be the right choice for you. Find a school that supports the dual degree.
Also my daughter applies as a BSOF. She could have applied as a BM and changed to BSOF but we didn’t really know not to be anything but honest - which is of course the best thing to be. In one of her many “I’m not good enough moments” with her teacher who is quite famous (like many of them), her teacher said “I wouldn’t have asked you to be in my studio if you weren’t good enough. I don’t have to accept a freshman BSOF student. There are plenty of grad students to pick from.” I thought it was curious that she mentioned the BSOF. She couldn’t have just said freshman. I still don’t KNOW what that meant but just FYI.
These are all the little nuggets that go into trying to find the right “fit” along with the evasive beautiful weather!