Audience participation was the name of the game for Bon Jovi who were were among the acts kicking off a concert series in London's Hyde Park on Friday (July 5).<br/> <br />The band and its lead singer, born John Francis Bongiovi, mark their 30th year in the music industry after establishing themselves in 1983.<br/> <br />The 'Barclaycard British Summer Time in Hyde Park' concerts are running back-to-back weekends with some of the world's biggest touring artists taking part.<br/> <br />Also delighting the crowds were British band the Kaiser Chiefs.<br/> <br />Tens of thousands of music lovers turned out on the hottest weekend of the year so far in London with temperatures rising to 26 degrees celsius.
