I'm a sound engineer, I worked at one of the larger music domes in my country and met quite some famous people in that. Want a list?
Metallica - Lars does not pay attention to anything at all, James is a cool guy a bit 'punkish' for his age but alright, Robert is very laid back and doesn't enjoy the attention as much, Kirk is bitching non stop about how he doesn't sound right.
Justin Bieber - When the kid doesn't have to worry about the regulations to what he says, looks like, how he smiles and where he looks at. He's actually a cool guy.
Jeff Dunham - Yes, he's funny especially when he does the voices when he doesn't have his dolls. He's a cool guy and is rather dicking around than preparing his show.
AC/DC
The coolest guys to have ever lived, very down to earth and had a great time with 'em. Got to meet Angus really well because he wanted to go to his house in Holland and I live close by so I brought him home, so to speak. Had a drink with him and his happy family, cool guy especially since I could speak dutch and he'd understand it. Which was very cool.
Jerry Lee Lewis - He arrived a day too early so I had a lot of time with the man. Let me tell you that man lived the live and knows how to live it.
John Legend - Nice guy a little too idealistic, but then again every damn guy with a vision and money is.
Avril (the rock chick)
Nice girl a lot more serious and professional then you'd expect. Fucking hot too, had to go there yes I did.
Queen
Atleast Brian I really got to know him with his musical 'We will rock you' the guy is really about as regular as they get, only this one is a rock legend
Marillyn Mason
Creepy guy, though when he's not putting up a show... You know the guy from jackass steve-0 that's him right there.
Mika - A total hyperactive nutjob if I ever met one.
Nine Inch Nails - Reznor has always been my idol and it was just sick to be able to hang out with him all weeked while he was staying in Amsterdam. Though as for their live music that's a ***** and a half to get to sound even half decent.
I could go on, with guys I worked with. But these are the most famous that I really got to know. What can I say, it's just my job And I fucking love it