Occasionally. The more notable bands I've seen would have to be Mayhem x2, Immortal, Nargaroth, 1349, Carcass, Suffocation, Cryptopsy x2, Neurosis, Black Sabbath x2, Melvins x3-ish, about half a song by Napalm Death, Extreme Noise Terror (without Dean), Nile, Slayer, Origin, Dying Fetus x2, Subhumans (U.K.), Toxic Holocaust, Cauldron, High On Fire, Sleep, Electric Wizard, Wolves In The Throne Room x2, Cloud Rat, Krallice, A Storm of Light, Tweak Bird, Sunn O))), Big Brave x2, Off!, Flag, likely more that I'm forgetting. I care about a number of these bands a lot less than I used to.