WARNING! Spoilers in the video and in Bear McCreary's blog post if you're not caught up on The Walking Dead (S3!).
When I first watched When the Dead Come Knocking, I heard this amazing, haunting...noise...in the soundtrack. CHILLING. I had to find out what it was.
I was THRILLED to find out that Bear McCreary doesn't just write the score, but he blogs about his process too. THANK YOU, MR. McCREARY!
He gives in-depth descriptions of the how and why of the music--WOW. This piece is seriously my favorite music from The Walking Dead (so far).
Here's the link to his blog post about it: http://www.bearmccreary.com/#blog/the-walking-dead/the-walking-dead-when-the-dead-come-knocking/