An awesome piece of music composed by Nobuo Uematsu. It was used in Final Fantasy VII while fighting Sephiroth.
One Winged Angel was inspired by Carmina Burana, as is noted by its lyrics which are also present in many Carmina Burana songs in adition to the style of music it was composed in.
~Sors immanis, et inanis~, ~Veni, veni, venias~