From my understanding MAME is very picky concerning what game dumps you have, and what version of MAME you use to run them. Contrary to most emulators, a lot of time newer versions of MAME just won't run older games that have "incomplete" dumps, while particular older versions won't care.
I would generally recommend looking for packs that contain both the emulator and roms together, since they're usually versions confirmed to work right together. Torrent sites in particular are your friend here.
"I think that the problem with this video is it is highly derivative of many popular bands within the genre. Although when viewed on its own merits, it does have a deeper groove. However what it has in groove, it lacks in originality. One can't help but be reminded of such bands as Pearl Jam, White Zombie, Suicidal Tendencies and other bands that bear the mantle of so called "Alternative Rock". One is even reminded of Lorie Anderson when she wore curlers. Hehehmhm! This video speaks less to the heart and more to the sphincter. In closing, I think Korn would do well to learn more from -"