One of the three albums that accompanied the release of Ar tonelico Qoga: Knell of Ar Ciel, and part of the third and (currently) final set of Hymmnos Concerts. This CD contains all of the songs and hymns sung by Akiko Shikata, Youko Ueno (yoko), and KOKIA, who serve as the Hymmnos Singers for the characters Saki, Ciela, Akane, and Tyria. It also contains the opening and endings themes to the game, Singing Hill - Harmonics TYRIA - and Ec Tisia, plus two bonus instrumental tracks that aren't present in the game proper.