The Composer controls everything that goes on in the Underground. He or she also tells the Conductor how to control the Reapers. The main job is to keep the Realground from being too affected by the Game, something that nearly happens in The World Ends With You. It is also hinted at that The Composer is the one who sends the players back to the Realground after they have won the Game. It seems that The Composer also chooses how many people come back to life after each week of the Game. The Composer in The World Ends With You is revealed to be Joshua at the very end after defeating the final boss.