Music used on X-factor

[HawkerHind]

When Dermot O'Leary walks out at the begining of the show through the doors, there's this rock music with a drum beat playing and it's been played a couple of times on there now. Any idea who it's by or what it's called?

Also throughout the whole series there has been some pieces of music played that I've wanted to know but it's very hard to describe them so anyone know how I may be able to find out?

Any help much appreciated!!...Jon