User blog comment:NaiflidG/Character "Theme Songs"/@comment-180.191.57.37-20131207123538

I seriously believe Castiel's theme song is "Angel with a Shotgun" by The Cab. It doesn't even really matter who he's protecting. In the end, he's protecting both Winchesters, not just Dean. He'll die for them, he would fight for them. To him, it doesn't matter if the angels would try and kill him, so long as the Winchester brothers are safe and alive, it's good enough for him.