Before creation God did just pure mathematics. The He thought it would be a pleasant change to do some applied. You'd think they would begin to understand it by now. The referee said it was not acceptable, but the Press considered they could not refuse to publish a book by a professor of the university. I listen only to Bach, Beethoven or Mozart.
Life is too short to waste on other composers.
The higher mental activities are pretty tough and resilient, but it is a devastating experience if the drive does stop. Some people lose it in their forties and can only stop. In England they are a source of Vice-Chancellors. Try a hard problem. You may not solve it, but you will prove something else.