I’m still confused. And due to time I need to be blunt: did you think you would be a computer scientist by day and an opera singer by night? Two full time professions? Or do you have a preference or you don’t know yet?
In general, with a dual degree, one degree ends up primary and the other secondary. Of course that can change for grad school where the secondary can be primary for a few years. Still college/life is not a candy store. You will have to make choices. How strongly you desire one or the other or both degrees could inform your decision.
There’s an old saying with performance degree: if you can imagine doing anything else, do it. If you can’t, then get a performance degree. In many cases music picks the student…they don’t pick music. Music students know the odds but still pursue a degree. If you truly hesitate about music (which is perfectly fine) maybe extracurricular music is a fine choice for you.
If money and time are not an issue, why not do a double degree? But if money and time matter, maybe extra curricular music is fine for you?
I would still encourage you to talk with a school guidance counselor, private music teacher and/or family and close friends. Maybe try to vocalize with them your career goals and the needed degrees. These people know you best and should be able to help you with an important decision.