This isn't Sephiroth's theme...
It's Vincents from when Cloud find's him in the Basement, It's called 'The Nightmare begins'
or something of the sort.

yay

great it was while in hollow bastion level

evilegg is right

he i right but is done better than most ones that are acctually correctly named
its definately one to download
ohh and if no-one else has noticed it is also used in kingdom hearts II i forget were but

Seph's Basement

In his basement lies pudding....yes, pudding and people lots and lots of emo people like vincent valentine.

Very nice. =D

This part in the game gives me chills, and mainly because of the music and the tinge of craziness that goes into it. Very good job. =D