You are in luck... during one of the UFC Fight Nights, Rogan and Goldberg's mics went out for a minute or two. The Pete Sell/Nate Quarry fight was about to start, so that awesome organ music played and there was no other sound (no Goldberg describing the matchup) other than a little bit of crowd noise. I just clipped out the good part and put it online:
YouTube - UFC Fight Theme