I ran away from three different boarding schools before joining a circus school, and eventually I became an actor. The only thing I learned at boarding school was never to send my child to one.
My appearance was always good and my ability to play on the piano, especially ragtime, which was then at the height of its vogue, made me a welcome guest.
Other, far fewer, directors are more like the composer - conceptualizing the piece, scoring it, distributing its musical lines among a range of registers, chords, and instruments.