The third and final day of one of the UK's biggest music festival kicks off on BBC3 with Greg James and Jen Long. First up is Californian act Haim, followed by The Lumineers coming live from the main stage for their first ever gig at the venue. Then it's time for a spot of nostalgia as the one and only Fall Out Boy rock up for their sole UK festival performance this year. This ain't a scene, it's a musical festival. Sheesh. Oh, and Disclosure also make their Reading Festival debut on the NME/BBC Radio 1 stage.