You seem to be confusing "solo founder" with "single person company". A solo founder can go and hire ten people, build an amazing team and knock it out of the

You seem to be confusing "solo founder" with "single person company". A solo founder can go and hire ten people, build an amazing team and knock it out of the park. A "single person company" is severely bandwidth limited across all required disciplines. That's the case of your music example.