"The Messenger" is the main theme song of the game, with lyrics from both "Cosmos" and "Chaos - Last Battle 1." "Cosmos" features female vocals, while "Chaos" is dominated by male vocals. In YFE's documentary on the conception of the songs for Dissidia, lyricist-vocalist Alex Foster admitted that the lyrics have no direct connection to themes of the game; rather, he left it up to the listeners to interpret the lyrics based on their thoughts and ideas.[26]