Panterachat

Ok, on the Reel steel tour they had this intro playing before breaking into Hellbound and they also had this in Moscow '91 before playing Domination.
Is this something they made themselves? I think I've heard something simular with Metallica.. Anyone know?

Metallica opens with the Ecstasy of Gold. I have no idea about Pantera.

They played it before cowboys was released too, its on a bootleg i have before they play psycho holiday

Someone said to me it was a david allan coe riff, but i seriously doubt that, doesnt sound like any DAC ive ever heard