I absolutely love old Flyleaf because of Lacey's voice. That banshie scream she has is one of my favorite things I've ever heard. I'm really saddened that she's not in Flyleaf anymore cause the replacement singer can't quite manage to hit the same stuff.
That's not the point though, cause this is the song with my favorite example of the banshie scream. Listen to it cause it's freaking awesome. From the intro to the end the dynamics are fantastic and all in all highly enjoyable.