The sampled heartbeat is what I was talking about (the pumping noise), it also appears at the start of Burning In The Skies, the song I am about to discuss. The heartbeat should also appear in The Summoning, and maybe Empty Spaces. I just think it would fit perfectly. Burning In The Skies was the first song I really liked when I was first hearing ATS. The intro is very nice, Mike sings well, Chester in the chorus is beautiful, the guitar solo is probably the best part of the song. Overall good song by Linkin Park.