Was Lilium written or composed solely for Elfen Lied? Elfen Lied's opening, Lilium, is a symphony sung in Latin.

Was it written/composed just for Elfen Lied (like for example, the opening songs for Pokemon)?
The answer is yes.

According to the pamphlet included in the Elfen Lied OST, the melody of Lilium just surfaced to MOKA, the two-person musician group who was appointed the music producer staff of the Elfen Lied anime TV production team, when they looked at Elfen Lied from a certain perspective: it's not that Lucy wants to be born special — what she desires, the mundane happiness, that which appears to be easily obtainable is in fact obtainable by only a small handful of people.


  望んで特別に生まれたわけじゃない、欲しいものは簡単に手に入りそうでほんの一握りの人しか手に入れられないであろう、ありふれた幸せ……そんな角度からこの『エルフェンリート』を感じた時に、メインテーマである「LILIUM」の祈るような旋律が浮かびました。


MOKA later included rearrangements of Lilium in Ryugu Genka, Shinra Soloist, Felix Culpa and LILIUM MOKA☆ Produce Mixed Chorus.