In the house

Like most writers (I think?), I play certain songs and playlists while I'm writing, and the emotional tenor of the music is keyed to the type of scene I'm working on. 

One of my favorite pieces to accompany a scene in which After a Long Buildup, the Shit is Going Down is this John Murphy's "In the house, in a heartbeat" from the 28 Days Later soundtrack. It builds layer by layer from a spare, repetitive piano riff - just two haunting notes, which somehow manage to suggest disorder and danger - to a driving, almost cacophonous crescendo. I'd listened to it dozens of times before I noticed something funny. Listen to those two opening notes (ignoring the poor labeling on the video):

And then listen to this (warning - loud):