The Rolling Stones have been booked as the halftime entertainment at Super Bowl XL, to be held Feb. 5. ABC will air the rockers' live performance on a five- to 10-second delay, presumably to safeguard against any slipped dentures nipples. What's more, Mick & Co. have announced a European tour that will kick off May 27 in Barcelona and offer concertgoers the chance to occupy seats onstage chairs usually kept handy in case Keith Richards gets winded.