Music theory professor. Then again, I can imagine you'd be arsed having to work with students. So maybe you'll end up as a house-wife/husband instead. The fun one who doesn't have any kids but can sort of stand your nieces/nephews. They somehow get interested in music and refer to you for help and being the inspirational you, with a really good Bostonian accent says, "Fuck off, don't you have anything better to do than bother your old woman/man?" (Imagine Will from Good Will Hunting but older and with a croaky, stressed out voice.)
Nah, I just thought that would be funny. You'd teach team with reluctance and they end up becoming some of the greatest musicians in history. Luckily, you're able to live to see that. Until you die. You weren't able to discover, however, that it was all in vain and they've received an infinite amount of negative publicity after people discover all their work has been plagiarized. See, they started off well, producing original work but life happens, people make mistakes... and that's fine, unless you're stupid enough to be famous as fuck while committing the mistake. IF you want to do something stupid, then at least do it quietly, goddamnit.
Anyway. Hope that's fun for you and everything.