Here's a round-up of the best live shots and pictures from around the sites at Reading and Leeds this Saturday. They've been, as Alan Partridge would say: "JURASSIC PARK!"
Childhood kicked things off at Reading with a scintillating set on the NME/R1 stage.
Childhood drew a crowd despite their early slot in Reading.
There really is no better way to start a Saturday than with some unabashed rock'n'roll.
Pure Love know how to work a crowd in Leeds.
First class crowd-surfing in Leeds.
The question is, does this trump the raft in the previous photo?
Mate, the stage is this way.
The 1975 played a surprise set on Reading's BBC Introducing stage.
If the haircut's good enough for Skrillex...
The 1975's set later on at the Festival Republic stage is expected to be packed.
Waka Flocka Flame knows the way to Leeds' collective heart... a football shirt.
Hiring Guy Fawkes as your DJ is also a strong move.
...and the crowd go wild.
Frightened Rabbit brought their brand of magic to Leeds Festival.
Scott Hutchison breaks hearts.
Drenge packed out Reading's Festival Republic tent.
...and ended up joining the crowd themselves.
Charlie Boyer and The Voyeurs arrive in Leeds.
Charlie Boyer and The Voyeurs dipped into this year's excellent debut album 'Clarietta', which received an 8 in its NME review.
It was all so much that Charlie needed a sit-down.
It's a dog's life for Bring Me The Horizon.
...and the crowd in Leeds lap it up.
Bring Me The Horizon: peace out.
EarlWolf blue themselves at Reading.
Swim Deep played a triumphant set at Reading.
Swim Deep in a quiet, reflective moment.
Swim Deep hit the target.
Parquet Courts practice their head-banging at Leeds.
Parquet Courts love a bit of bass face.
Even at Leeds, this is inadvisable after several pints.
Ms Mr get moody in Leeds.
Jagwar Ma help the Reading crowd get their dancing shoes on.
At the end of Jagwar Ma's set, the crowd were 'Howlin' for more (Sorry).
EarlWolf got 'nasty' on the Reading mainstage.
Tyler returns to the scene of last year's anarchic OddFuture show.
Earl Sweatshirt took centre stage after the release of his impressive new record 'Doris'.
Jagwar Ma's set was, well, blinding.
The Wytches put in a supernatural shift on Leeds' Festival Republic stage.
The Wytches again proved why they're generating an unmissable buzz.
Temples wigging out in Leeds.
... although that beautiful barnet is definitely not a wig.
Action Bronson meets his fans.
Back on stage after his walkabout, Action Bronson lays down some rhymes.
Tame Impala take Reading to another dimension.
There was no danger of 'Lonerism' during Tame Impala's packed out show.
Peace wowed Leeds - even if they managed to start a fuckus with Diplo in the process.
Harry from Peace goes for the androgynous look.
Chilli from Palma Violets dives into the crowd during closer 'Brand New Song'.
Chilli pulls his best Nick Cave moves while propped above the front row.
Palma Violets' played a resounding set to a packed NME/R1 tent.
Fidlar get in on the crowd surfing action in Leeds.
Now *that's* how you do it.
Fidlar need a rest after all that excitement.
ASAP Rocky arrives in Leeds.
A$AP on regal form.
A$AP's crowd showed him a whole lotta love.
Johnny Marr delved into his Smiths back catalogue at Reading.
Johnny Marr in Godlike, guitar hero pose.
Billie Joe Armstrong brings Green Day to Leeds.
Green Day's live show is epic in every sense.
Chase & Status caused a stampede at Reading.
Someone should tell Chase & Status they've blown a bulb.
Eminem and his hype man step out onstage at Reading.
Eminem turns on the bright lights.
Eminem surveys his audience.
Eminem in full flow.
Tame Impala, lit up like a Christmas tree.
This is Kevin Parker's concentration face.
Foals drew a massive crowd to Reading's main stage.
Yannis gets close to Foals' fans.
Foals make their case to be future headliners.