Honestly, KoRn is a close second as greatest band in the world for me, after Disturbed ofcourse. Jonathan Davis' voice is so incredible it's almost mind blowing. I love that you can hear the emotion in his voice in almost every song, it's just amazing.
I saw them live at Family Values '07 in Toronto, they kicked ass man! Love Davis' custom mic stand too.
You want to hear some raw emotion in a song, listen to songs like "Daddy" off their CD "KoRn" or "Counting" off "Issues."
Just generally a fantastic band.