You can certainly do what ever you want. But there are distinct rigid structures to all forms of music. If I make a close approximation to B.B. King's "3'o'cloc

You can certainly do what ever you want. But there are distinct rigid structures to all forms of music. If I make a close approximation to B.B. King's "3'o'clock Blues". It is most certainly Blues and not a Polka song or Reggae. Even Avant-garde Jazz has a common theme. Music is formulaic.