All my kids are heavy in creativity/art/music. One planned to be an artist and live in a treehouse. We told her that was great, but since most kids don’t graduate from high school, move into a treehouse, and begin selling their art at high prices, she needed a plan to support herself on her way to her dreams. Suddenly, late in junior year of high school, she decided she did not want to do art for pay, and wanted to be an engineer (?!?!). Fortunately she had the grades for it, majored in architectural and structural engineering and happily works in that field now. She still does art for fun. She may yet live in a treehouse. It wouldn’t surprise me.
Another one my creative kids is a music major and plans to teach. He considered majoring in music performance and was even accepted to college as a performance major but is really passionate about teaching. If your son is considering majoring in music he should look into the ways of studying music and see what fits him best, especially since you say he’s mostly self-taught.
Another of my kids did music since age 5, and theatre in high school, could easily pick up and learn any instrument and has some crazy graphic design-type natural abilities. She is working on a graduate degree in the social sciences. She didn’t do any music or theatre in college at all.
There’s also more artistic opportunities than you’d think in the field of welding and that doesn’t require a college degree, typically just a certificate, in our state at community college.
There’s a lot of ways your son could take this. The suggestion to look at a list of college majors from a large university, cross off the ones that don’t sound interesting, then comb through what’s left in more detail, was helpful for a couple of my kids.