Thanks Leftfield! Pretty interesting. I love the music on Castle, especially in the darker episodes.

I like that part :

When we meet on an episode, the producers will give very detailed descriptions of their hopes for a scene, asking me to take whatever information is useful to me to help them achieve their goal. They'll tell me, "Don't give us what we ask for, give us what we need." It is their way of tactfully reminding me that I'm hired to do more than transcribe.