"Lilium" from the anime Elfen Lied is performed in the key of E minor. Composed by Yukio Kondo, the hauntingly beautiful song serves as the opening theme for the series. The lyrics are in Latin and are based on the Gregorian chant "Salve Regina." The piece is sung by Kumiko Noma, and its ethereal melody and angelic vocals create a stark contrast to the dark and violent themes of the anime. "Lilium" has become iconic among anime fans for its evocative atmosphere and emotional resonance, contributing to the overall impact of Elfen Lied.