First, we conspired and argued until they came up with a list of the 66 Greatest Metal Songs of all time. Then, we asked Metal God Dave Mustaine to host this countdown, which he graciously agreed to. And finally, we asked bands like Korn, Papa Roach, Device, Sick Puppies, and even Steel Panther to weigh in with their thoughts on this list. Put it all together and you've got an unholy countdown of 66 songs that are Louder Than Hell. From The Big 4 to the '70s pioneers, you'll hear the most comprehensive look at metal over the ages here.