Biography
Ciel Bleu is the name of the fictional band from the anime BECK: Mongolian Chop Squad.
Koyuki, Saku, and a couple of their classmates enter the school "battle of the bands" contest as Ciel Bleu. They perform the song "妖怪人間ベム" or "Youkai Ningen Bem".
Biography text from Last.fm, available under CC BY-SA.