Lilium is the opening theme song for the anime Elfen Lied. It is based on several biblical passages and the hymn Ave mundi spes Maria (Hail Mary, Hope of the World) in Latin (and a couple of words in Greek). The lyric and melody are authored by Kayo Konishi and Yukio Kondou, after being requested to make the song like a Gregorian chant, and was performed by Kumiko Noma.