The Prodigy have headlined the first night of this year's Sonisphere Festival.
The dance act rattled through many of their greatest hits including tracks like Firestarter, Poison, Omen and Vodoo People.
They also played new songs Awol, Rock Weiler and Spitfast, which may make it onto their sixth studio album, due out this year.
Sonisphere is taking place for the first time since 2011 this weekend.
Before The Prodigy, Limp Bizkit drew a big crowd to the main stage at Knebworth House.
The nu metal band from Florida played in the same slot at Sonisphere in 2011.
This year their set was opened by Southampton female trio The Lounge Kittens, who sang their re-worked version of the band's UK number one hit Rollin' from 2000.
During Limp Bizkit's set the rap/rock act played parts of George Michael's Faith, Michael Jackson's Don't Stop Till You Get Enough and Rage Against The Machine's Killing In The Name.
Before singing My Generation, lead singer Fred Durst told the crowd: "Thanks for having us in your home. We're honoured."
Also on the main stage Finnish rockers HIM performed their cover of Chris Isaak's Wicked Game but had to skip a song at the end of their set with the day's schedule running late.
Earlier veteran singer Gary Numan sang his number one single from 1979, Cars, as well as tracks which spanned his 36-year career and 22 studio albums.
Also playing on the first day were Band of Skulls, The Defiled, Comeback Kid and Carnifex.
Paul Berry, 21, Willow Dowd, 18, Jake Raybold, 21, and Lewis Ward, 20, from Birmingham, play in their own band called Second City Fire and said they were looking forward to seeing Deftones, Alice in Chains and Karnivool.
Lewis said he only bought his ticket last week.
"I needed the money before that," he said. "But I wanted to come.
"Sonisphere has it pros and cons but there's a lot less walking to do than at other festivals."
Saturday sees performances from Frank Turner, Slayer, The Sisters of Mercy, Chas & Dave, Blitz Kids, Vodoo Six and Japanese act Babymetal.
Iron Maiden end their latest world tour at Sonisphere by headlining.
The band's lead singer Bruce Dickinson is also due to take part in a mock aerial dogfight above the grounds of Knebworth House at 18:00 BST to commemorate the start of World War One.