Veteran rockers the Rolling Stones played in front of 33,000 fans as the latest leg of their European tour kicked off in Belgium.
Interest in the concert, held in the town of Werchter, caused a traffic jam which extended for 50km (30 miles).
Concert-goers were stuck in the tailback, which was made worse by an accident nearby.
The Belgian press greeted the Rolling Stones performance with rave reviews, with De Morgen calling it a "triumph".
The Stones' 30-date show takes in new venues for the band including Serbia and Russia, with three dates at London's O2 arena in August.
Carbon footprint
The latest leg of their A Bigger Bang tour will also take in France, Spain, Portugal, the Netherlands, Ireland, Germany, Italy and Scandinavia.
Poland, the Czech Republic and Hungary are also on the itinerary.
Their concert in the Serbian capital Belgrade was due to take place at the city's racecourse, but was moved after fears that it would upset 300 horses in nearby stables.
More than 80,000 tickets are being sold for the 14 July gig.
The band's previous world tour in 2006 became the biggest-grossing set of gigs in history, making more than $100m (£50m).
This weekend, the Rolling Stones are to headline the Isle of Wight festival, their first UK festival appearance since Knebworth Fair in 1976.
Sir Mick Jagger has said that "it would be great to do Glastonbury" in the future.
He recently admitted that the band's carbon footprint was "rather enormous" due to their extensive touring, but added they started taking measures to offset it three years ago.
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