Metallica say deciding to headline Glastonbury was a ''no-brainer''.

The heavy metal band have been confirmed as the third and final festival headliner, joining Kasabian and Arcade Fire on Worthy Farm's Pyramid Stage, and claim they jumped at the chance to close the line-up on Saturday, June 28.

Drummer Lars Ulrich told Zane Lowe during a BBC Radio 1 interview: ''To be honest with you, we didn't sit around and have a big conversation when the call came.

''In Metallica we have a saying called a 'no-brainer'. Headlining Glastonbury is a no-brainer. We didn't need to sit around thinking about the pros and cons.''

The group are the first metal band to ever headline the festival in its 44-year history and fans have had mixed reactions to the announcement.

One wrote on Twitter, ''Glastonbury is probably the only festival that could have Beyonce headline one year and Metallica another'', while another far less enthusiastic festival-goer lamented, ''Buzzing for Metallica at Glastonbury. Said no one ever.''

But Lars is confident the band can convert new fans with their aggressive, thrash metal sound and will do their best to appeal to the masses.

He said: ''Trust your friendly neighbourhood Metallica, we'll put something suitable together. It's great that, 32 years into our career, we're still able to knock down doors - doors we didn't think were open to us.''

Metallica - who were rumoured to be headling earlier this month - made the announcement last night (08.05.14) by writing on Twitter: ''Worst kept secret in rock and roll is now confirmed... see you at @GlastoFest on June 28th! #MetOnTour.''

Meanwhile, Skrillex, Jake Bugg and Massive Attack have also been confirmed to play on the Other Stage.