These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
More specifically, the Guitar Hero Effect. Many people only know Lamb of God through the appearance of "Laid to Rest" in both Guitar Hero 2 and Guitar Hero: Smash Hits (the original version, as with "Killing in the Name"). You can't really blame the people playing the game for wanting to hear the real thing (which would also appear as downloadable content for the Rock Band games).
There's also the case of others who were introduced to the band with "Black Label"'s inclusion in Tony Hawk's Underground 2, though in a minor scale than "Laid to Rest".
As does those who heard "11th Hour" on the soundtrack for Freddy vs. Jason soundtrack.
Others instead might know them because of their appearance in Saints Row 2 with "Redneck".
"King Me" off of "Resolution", if the dark depressing lyrics, the haunting One-Woman Wail in the background or Randy's horrific screams of rage and insanity don't get to you, especially at the end, don't know what will. It's basically their "Floods".