Who: Klaxons
Where and when: Park Stage, 7.50pm, Saturday
Dress code: Like members of the Tim Burton fan club. Simon Taylor was in a Beetle Juice suit and frightwig, James Righton's chiselled cheekbones perfectly complemented his Edward Scissorhands outfit while Jamie Reynolds came as, er, a headless man. We're guessing that he was the Sleepy Hollow's apocalyptic headless horseman. His demonic steed was probably eating grass in the Green fields.
What happened: This was the worst kept "secret" show of the festival since Klaxons let slip they were playing via their website last week. Reynolds greeted the big crowd with an impishly ironic "surprise". Their set was an ecstatically received, 45-minute rollic that included all the party tunes from first album Myths of the Near Future (Atlantis to Interzone, Golden Skans, Magick, Gravity's Rainbow and It's Not Over Yet) and they sneaked in two excellent-sounding new tracks, Hooda Bora and Future History. By the end, Reynolds's default scowl had softened to a beaming smile. "This is magical," he said, "I'll never forget this day." Good lads. Now stop messing about in the dressing-up box and make a second album.
Who's watching: Boys in skinny jeans and plimsolls. Girls with glitter on their faces. Not many people with heritage-rock beards.
Low point: Righton hitting bum keyboard notes. Out of practice, obviously.
High point: Klaxons have taken so long to record new material that glowsticks have gone out of fashion. The mass singalong to Golden Skans, the first of many.
In a tweet: Klaxons star in rocky horror show. We know your old songs are rabble-rousing crowd-pleasers. Write some new ones.