Probably Pantera, especially circa 1990-1994, and especially before the BS between Phil Anselmo and Dime & Vinnie went on within the band that led to the band's demise.

Also Megadeth, circa 1986, when they had Chris Poland and the late Gar Samuelson, as well as Metallica, circa 1983 - September 26, 1986, when Cliff was still alive. Or any thrash metal concert during the 1980s, for that matter, especially the Reign In Blood-era Slayer, the Among The Living-era Anthrax (even though both line-ups are intact right now, but you know what I mean), and Testament during the late 80s.