Down and former Pantera vocalist Phil Anselmo joined the Metal Masters -- a lineup including  Anthrax's Scott Ian, Frank Bello, and Charlie Benante as well as Slayer's Kerry King, Megadeth's David Eleffson, and ex-Dream Theater stickman Mike Portnoy -- to rock out some Pantera Classics.

If ever there were a metal supergroup -- this one is the ultimate. Featuring only those truly befitting the title "Metal Masters", the group made up of mostly participants of The Big 4 shows took to the stage last night (Sept 12th).

Those in attendance at New York's Best Buy Theatre for the 2nd annual 'Metal Masters Clinic' were in for a real treat as Phil Anselmo joined the already star-studded lineup. The group fired through a rousing cover of 'A New Level' and 'F---ing Hostile', songs Anselmo originally brought to life with Pantera.

While Phil is currently on the road with Down, the members of Anthrax, Megadeth, and Slayer, will all share a venue (and most likely a stage) along with Metallica tomorrow night (Sept. 14th) at Yankee Stadium for the first east coast date of The Big 4 tour.