this song is from even before they were LP. They were called Hybrid Theory (the title of their first album as LP :P ) This is from their first EP, Hibrid Theory EP. http://en.wikipedia.org/wiki/Hybrid_Theory_(EP)
The Name HT EP is right but the cover is really not the right one ..the reason that this album isn't listed at amazon or other stores is that it's never really released because of name conflicts..you can read it on wikipedia.org
Brilliant song. They needed songs in this sort of style on Hybrid Theory...although it does have a much darker tone than that album. I like Chester's like humming type in the background of the instrumental section...gives the track a very dark tone.