The festival has announced a list of 75 artists set to play, including performances from Mary J Blige, Florence & The Machine Alt-J, Pharrell Williams and Patti Smith, who will likely be playing tracks from her debut album Horses, which celebrates its 40th anniversary this year. Other notable names on the list include a collaborative performance between Franz Ferdinand and Sparks, a set by the Moody Blues – now into their sixth decade as a band – and the Mothership Returns, which will feature funk legend George Clinton, Parliament, Funkadelic and the Family Stone.