etiquette shooting live bands in small pub

[canadave]

I'm an amateur just getting into photography a little bit as a hobby. I live in a small town with a small intimate pub (seats maybe 60 people if they cram them in at tables next to each other), and the pub hosts live music acts. I'm an acquaintance of the owner btw (she knows who I am, I know who she is, we say hi if we run into each other there), but I wouldn't call us "friends."

I'd like to try to get some photos and/or videos of bands that come through, but I'm not sure what the etiquette is, both in terms of dealing with them, and dealing with the pub owner, not to mention the patrons or whoever's in charge of the bar at that particular time. There's not a whole lot of room to stake out a spot...I'd almost certainly be in someone's way, even if it's just being in the way of the waitress as she goes back and forth to the kitchen in the narrow walkway. And do I need to ask the band's permission? The pub owner's permission?

How do you all deal with this kind of thing?