This piece is from the album Shadows and Nightmares. The album itself is just like what the name intends, rather, implies. I've gone through the whole album one night and I have never feared for my life in such a long time. The repertoire is full of compositions that I would not recommend listening to at night, unless scary stuff is your thing.
Safe to say they really impressed me with the album, unless you count being scared for two days impress then sure, go nuts.
By the way, when you're listening to this think about Damien from the Omen movie except that it's a girl and she's following you - everywhere.
Why are girls always scarier when you attribute them to the horror genre? :'(