I'm still wondering what the method of income would be. It's got to either be from performing or teaching or both. But someone straight out of high school in this case would already be doing that, ready to step into that full-time after they're done with high school. Although being home-schooled would make that transition even easier. It would be more of a shift in emphasis, and good riddance to the general studies. Haha.
Or some kind of generic part-time job could help. Perform, teach, work at a generic job. Although half of the performing job would be the business side. Teaching has planning too. That could easily go beyond 40-ish hours/week for sure, but the music side would make it worth while. Except for turning music into work, but it's music.
I'm wondering what type of performances too. Who's going to pay to hear a high school kid? I'm thinking solo performances/recitals for that. For more blue collar style work, I'm sure there's that, but even then I've heard wedding musicians are making about $12,000/year at best, working each weekend. Of course a pianist would probably have an advantage for ceremonial work, being able to double for an organ part and being able to play for the actual ceremony as well as the prelude and postlude music, a one-person show. More money, as opposed to having to split it up between ensemble members.
Though you would have at least $100,000 saved and probably over four years of time saved by not going to college too. For those generic jobs, the interviewer would probably use a college degree as a way to narrowing down the applicant pool too though.