What is the song that plays when Muramasa charges at Ichigo?


I heard several times but can't find the song. It plays in season 13 in
episode 253, starting around 9:58, right when Muramasa charges at Ichigo after
turning into a hollow.




It's **Shadow's Masquerade**.

The first usage of the soundtrack is in episode 88 of the Season 4: Bount arc.
The music itself is the track #16 from [BLEACH Original Soundtrack
2](http://vgmdb.net/album/22885).

