I'm not entirely sure in what time it was written but months ago our philosophy teacher showed us O Fortuna, a quite remarkable song which is probably from the Middle Ages, when people believed in angels, demons, curses, etcetera.
Everyone must have heard something similar to this at some point in their life. It's the typical old, dark, creepy latin song that appears sometimes in some series. In this case I remembered this song from an OST from an anime called Death Note called Low of Solipsism.
If you are reading this when it is first posted then there are only 6 ir 7 tracks as the tracks for LPU15 will be released month by month.