By Kev Geoghegan
Radio 1 music reporter
It has been 15 years since Rage Against The Machine last played T in the Park and more than a decade on, their anger and frustration remains undimmed.
The US rockers attracted a huge crowd of fans to the front of the main stage at Balado by Kinross.
Proving they are still capable of causing controversy, the band refused to allow photographers into the pit or have their headline slot filmed.
The band kicked off with Testify and performed in front of a huge red star.
Gone are the trademark dreadlocks but 38-year-old Zack de la Rocha still bounds around the stage with the energy of a 20-something.
During Know Your Enemy, de la Rocha urged on the massive crowd to sing along with the track's final lines: Ignorance/Hypocrisy/Brutality/ the Elite/All of which are American Dreams.
With Kaiser Chiefs on the Radio 1/NME stage, the average age of the Rage crowd was probably a bit older but they were the most vocal of the weekend.
T was Rage Against The Machine's first UK appearance for eight years
Bullet In Your Head had a mass chant of the lyrics: They say jump/You say how high?
The band's body language has changed little in the eight years since they split.
Between bouncing up and down, de la Rocha crouches and grimaces and glares at the audience.
Bass player Tim Commerford, with his plated armour-style tattoo covering three quarters of his upper body, strikes combative poses.
Tom Morello is starting to look a little dad-like with his baseball cap and shirt with his name badge but his guitar style hasn't aged in the least.
In fact, Rage Against The Machine's sound is built around his use of distortion and feedback as demonstrated on their track Sleep Now In The Fire.
As they tore through Renegades of Funk, de la Rocha again urged fans to lift defiant fists in the air.
By now, they would have done pretty much anything he asked of them.
He then claimed to have been misquoted by the American press over comments he made during the band's set at the Coachella festival in California in April.
The singer said he had been accused of calling for George Bush to be assassinated.
85,000 people are at T in the Park to watch more than 180 acts
But he repeated a call for the American President to be tried for war crimes, before launching into their song Wake Up.
Rage then left the stage, leaving some fans wondering whether they would hear their biggest track, Killing In The Name.
They need not have worried as Zack and the rest of the band came back for an encore of two songs, finishing on the signature track and that infamous chorus: F**k you, I won't do what you tell me.
Rage got a rumoured £1m for their slot at T in the Park.
For the thousands who watched them, it seemed worth every penny.
Ray Melville from Glenrothes said: "It was amazing, best thing is the world.
"The rage is still there."
Just don't expect him to wait another 15 years.