Pearl Jam played one of their biggest shows since the Roskilde tragedy in 2000 when nine people were killed as a result of a crowd surge during their set.
The band have shied away from playing big festivals ever since and told the Leeds Festival crowd: "There were reasons why we haven't played a festival for a long time. It was nothing to do with the fact we had no guts, we just needed your trust."
The five-piece tore through tracks from their back catalogue, mainly from their first two albums, 'Ten' and 'Vs'.
Highlights included 'Daughter', 'Even Flow' and 'Black'. The band finished with crowd favourite 'Alive' and a cover of Neil Young's 'Rockin' In The Free World'.
However, cover version of the day had to be Klaxons' version of '90s trance anthem 'Not Over yet' by Grace over in the Carling Tent.
The Kooks generated one of the biggest crowds over in the NME/Radio 1 Tent, with thousands cramming under the canvas, leaving many having to watch the band's set on screens outside in scenes reminiscent of Arctic Monkeys last year.
In between playing hits from their debut album, singer Luke Pritchard and the stage manager both made announcements urging the crowd to move back to prevent crushing at the front.
There have also been great sets from My Chemical Romance, Boy Kill Boy, The Rakes, Tapes'N'Tapes and many more - and it's only day one!