The only time I can think of offhand is when I was doing public relations for the Benson and Hedges Blues Festival/ John Lee Hooker tribute at Madison Square Garden.
The people I met backstage (Mick Fleetwood, Bonnie Raitt, John Lee Hooker, Johnny Winter and more I can't really think of right now) weren't stereotypical "trash the room and f**k the groupies" rockers, plus I was there in a professional capacity so it was all very laid back and pleasant.
And the food was yummy, too
