More than 60,000 revellers watched artists including headliners Kasabian and David Guetta perform on the opening night of T in the Park. Scotland’s biggest music festival is taking place for the first time at Strathallan estate in Perthshire and as in previous years has drawn some of the music industry’s top performers. Mark Ronson, Sam Smith, Rudimental and The War on Drugs played earlier to crowds in the grounds of the 19th century Strathallan Castle.