"Final Fantasy XI Chains of Promathia Original Soundtrack" was produced by Square Enix in 2004 after the release of the "Chains of Promathia" expansion, and in 2005 Square Enix published "Music from the Other Side of Vana'diel", a collection of arranged tracks from the game performed by "The Star Onions", a group composed of Square Enix composers including Naoshi Mizuta, Kumi Tanioka and Hidenori Iwasaki.