Karma Killer is one of my favorite Linkin Park songs (Yes, I know it only inlcudes Chester - but I still classify that underneath LP) Really get into it, and hear Chester's contributions at the end... "My Eyes are Weary...." "Will I ever Miss You..." It's amazing.
Not to mention all the backing vocals he does earlier on in the song too. You can hear Chester all the way through the song. He sings along with the Cyclefly singer in the verses and chorus.