[It's a very reasonable misunderstanding. Kurama himself isn't entirely sure why there are so many sound-based terms to this whole thing. He taps his chin lightly as he considers how to explain this.]

...Some worlds are being menaced by creatures called Noise, that feed on negative emotion and will breed until they destroy everything. The job of a Composer is to run what is called the 'Reaper's Game', where the souls of the dead destroy Noise and work at tasks set to them. If they win the game, they can be returned to life.