The Smoking Gun has released what some of the celebs require for their performances.
"Celine Dion cares deeply about the comfort of those attending her concerts, according to the singer's 2008-09 tour rider, excerpts of which you'll find below. The Canadian songbird requires promoters to provide "soft seated chairs for the audience," since the rears of Dion fans should never touch a folding chair. The rider also requires Dion's medium-size dressing room to be kept at 73 degrees, and outlaws Ruffles-style potato chips. And as for the performer's fresh breath, credit goes to a small pack of Clorets gum."
"You know a band has been around a long time when its rider requires the provision of three oxygen tanks and three masks. That's one requirement on the AC/DC 2008 tour rider, excerpts of which you'll find below. The band's alcohol requirement consists of exactly one case of Heineken in bottles, though the rider notes, in bold letters, "no beer in dressing room prior to show." However, Angus Young & Co. are presumably allowed to enjoy that small selection of "fun size" candy bars before a concert. Ditto that tasty assortment of imported cheese and crackers (of course, "English cheeses and water crackers preferred")."
Have a look for yourself.