So...i heard a lot o' people talkin about those artists/bands and i was wonderin' if u could ...?

I can't tell you about all of the bands/artist you've listed but korn's biggest hit to date would most likely be freak on a leash, I think it was released in 1999, otep is awesome but haven't had that much commercial success, system of a down has had so many songs that are popular that it is had to say what their biggest hit has been, nirvana smells like teen spirit, the offspring has pretty fly for a white guy even though it definitely isn't their best song, AFI is just started to really get major radio play within the past few years and the rest even though I know who they are I don't know enough about them to give you any reliable info