Iron Maiden and Metallica have been confirmed as the first two headliners for next summer's Sonisphere Festival taking place at Knebworth House.
The British Heavy Metal legends and American thrash Metal giants will co-headline the three-day event being held in the grounds of the Hertfordshire stately home next July.
This will be the only UK shows by Metallica and Iron Maiden in 2014 and it is first time they have appeared together on the same festival bill in the UK.
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Both Metallica and Iron Maiden headlined their first ever Knebworth concerts under the Sonisphere banner, in 2009 and 2010 respectively and next year's festival, taking place from Friday 4th July to Sunday 6th July celebrates 40 years of rock at the iconic outdoor venue.
A Sonisphere statement read: "And now these giants of the world stage return together to fly the Sonisphere flag once more; bigger and bolder than ever before.
"For the first time ever fans will have the chance to see both bands come together to head up what will surely make for one of the most historic festival bills in heavy rock music."
Maiden will bring their immensely successful 'Maiden England' World Tour to a spectacular finale while Metallica will be performing a special career-spanning set requested by fans.
Fans who purchase tickets online will be invited to vote on the setlist Metallica will play at the show – giving them the chance to help build their dream set from the 30 plus years of Metallica's material and close to 140 recorded songs to date.
Tickets are on sale now via the Sonisphere website at http://sonisphere.co.uk.