The song ist from the anime "Madoka Magica / Puella Magi Madoka Magica". Watch it. Especially the OST is absolutely worth it.
Original song: Kajiura Yuki, performed by Kalafina
UST: DachoLOID
UST edits, Mix: Sylveranty
French lyrics: Mélodie L'otaqueen www.youtube.com/watch?v=Z5RjxHwa39M
English lyrics: AmaLee www.youtube.com/watch?v=b2Chwj5JEww
German lyrics: Paperblossom www.youtube.com/watch?v=lu98k5vVP-Y
