I know a current Belmont student with a profile similar to yours, so I agree it is a good match if it meets your budget.
Are you saying you can afford $30k/year and the Net Price Calculators on each school website are getting you there?
I think it is unlikely that any of the UC schools will be affordable. They are public universities and stingy with aid to out-of-state students. Instead, maybe run the Net Price Calculator at Occidental College in California.
For a potentially more affordable school with a 68% acceptance rate that might be closer to a likely admit/safety, look at Middle Tennessee State, which has a good music business program. Of course, run the Net Price Calculator there, too.