Just an fyi. I know one baritone and one tenor who are relatively recent MM grads from top music schools. One was an architecture undergrad and the other business undergrad. Both took weekly private voice lessons for all four years as undergrads and both kept up with music theory. Neither one double majored or did a dual degree. However they were singers from a young age and both were from musical families.Both were admitted to the best young artist programs are they are now doing very well indeed as professional opera singers.For grad school and for young artist programs, they pretty much care about how well you sing and whether or not you can read music proficiently. It’s doable, especially for in demand male voices. (For the almost impossibly competitive world of operatic female voices? Not so much.)
AND I also know of many music majors who are doing very well in the business world. So…