That's a big lol at any form of music being "done". How and when would you judge something as broad as a musical style to be "done"? In your opinion, if most o

That's a big lol at any form of music being "done". How and when would you judge something as broad as a musical style to be "done"? In your opinion, if most of the "interesting permutations have been tried" what innovations would it take for a new genre/style to develop and broaden the scope of what can be expressed?