Metallica will release a new song today (20.06.14) ahead of their headline set at Glastonbury festival.
The 'Enter Sandman' band, who will be the first heavy metal act to top the bill at Worthy Farm next week, have released 'Lords of Summer - First Pass Version' via Blackened Recordings, which the group first debuted in March at a concert at Parque Simon Bolivar in Bogotá, Colombia.
The new recording clocks in at eight minutes and 20 seconds and recalls the group's thrashier '80s offerings, with a fiery solo from lead guitarist Kirk Hammett.
The band's drummer Lars Ulrich told Rolling Stone that the song is "fairly representative of where our creative head space is at right now."
It is not yet known if the track, which is their first new material in six years, will be included on Metallica's next album, the follow-up to 2008's 'Death Magnetic' album.
Footage shot by a member of the audience in Colombia saw the song posted online and it was shared between fans before Metallica put out a "garage demo version".
A post on the band's official Facebook page in March revealed the group's plan to unveil a new track.
A picture of all four members of the band - frontman James Hetfield, plus Rob Trujillo, Lars and Kirk - was accompanied by the caption: "Working out the kinks in the new song that we'll be debuting in South America in a couple days."
Earlier this year, Metallica guitarist Kirk said that the band "have to" start working on their next album.
When asked if the record would likely be released next year, Kirk replied: "I'm f***ing up for it, man."

Ben Affleck could star in his own standalone 'Batman' movie. The 'Argo' actor has reportedly landed his own solo outing set for 2019, which Warner Bros. is lining up to follow on from 'Batman v. Superman: Dawn of Justice' in 2016 and 'The Justice Leag...

Matt Damon will reportedly return for 'Bourne 5'.
The 43-year-old star is said to be in talks to reprise his role as amnesiac assassin Jason Bourne following his departure from the series - which is based on Robert Ludlum's books of the same names - after the third Paul Greengrass directed film, 'The Bourne Ultimatum', in 2007.
Damon claimed earlier this year that he wouldn't return to the series unless Greengrass returned as director, saying at the time: "I've always been open to it if Paul Greengrass is the director."
However, with Bourne 5's release date being delayed until July 15, 2016 the Latino Review has reported that it's because Damon has agreed to return to his signature role under the direction of 'Fast and Furious' filmmaker Justin Lin.
Earlier this year, Universal hired 'Sherlock Holmes' scribe Anthony Peckham to write a script for the new 'Bourne' film.
In 2012 'Hansel & Gretel: Witch Hunters' actor Jeremy Renner took over the franchise as agent Aaron Cross, alongside Rachel Weisz as a black ops agent.
Damon also starred as Jason Bourne in 2002's 'The Bourne Identity' and in 2004's 'The Bourne Supremacy'.

Britain's Duchess Catherine has urged people to support children's hospices.
The 32-year-old duchess - who has 10-month-old son Prince George with husband Prince William - made a low-key visit to East Anglia's Children's Hospices' Treehouse (EACH) in Ipswich in her role of patron of the organisation during Children's Hospice Week this week, and met with volunteers and patients.
And Catherine said being patron allowed her to see how important the "remarkable" facilities are.
She said: "Around the clock support is crucial for children receiving palliative care. They and their families often need help every hour of every day, both in hospices and at home.
"As patron of EACH I have seen first-hand this remarkable and varied work and just how vital the support of staff and volunteers can be to the families of children with life limiting conditions.
"It has been wonderful to see the fantastic public support for Children's Hospice Week over the last few days.
"Please continue supporting your local children's hospice in whatever way you can."
Meanwhile, executives at EACH praised Catherine for being a "very active" patron of the organisation.
Graham Butland, chief executive of EACH, said: "As our Royal Patron, Her Royal Highness has really helped put children's hospice services in the UK at the forefront of people's minds and allowed us to demonstrate the full and flexible range of services families can benefit from 24/7.
"The very active role the duchess plays, both publicly and in private, is considerable and much appreciated by our staff, volunteers and of course the children, young people and families using our services."

'Orange Is the New Black' and 'Fargo' were the big winners at the
Critics' Choice Television Awards last night (19.06.14).
The Netflix comedy-drama and the FX series each scooped three prizes at the Broadcast Television Journalists Association's fourth annual ceremony, while 'Breaking Bad', 'Cosmos', 'The Normal Heart' and actress Allison Janney took home two trophies each.
'Orange Is the New Black' picked up Best Comedy, while its star Kate Mulgrew shared the Best Supporting Actress in a Comedy Series prize with 'Mom' star Allison and Uzo Aduba won Best Guest Performer in a Comedy Series.
Meanwhile, 'Fargo' was named Best Mini-Series, Billy Bob Thornton took home Best Actor in a Movie or Mini-Series and Allison Tolman won Best Supporting Actress in a Movie or Mini-Series.
Matthew McConaughey - who already picked up an Oscar, Screen Actors Guild and Golden Globe awards this year - was named Best Actor in a Drama Series for his work on 'True Detective'.
In his speech, the 'Dallas Buyers Club' actor paid tribute to the great work being done on the small screen.
He said: "Television is raising the bar for character-driven drama."
Other notable winners on the night included 'Glee' creator Ryan Murphy, who was honoured with the Louis XIII Genius Award, and used his acceptance speech to read out a number of negative tweets about himself - which he promptly agreed with, much to the amusement of the audience at the Beverly Hilton Hotel.
The ceremony was hosted by Cedric the Entertainer.

Critics' Choice Television Awards full list of winners:
Best Drama Series:
'Breaking Bad'

Best Actor in a Drama Series:
Matthew McConaughey, 'True Detective'

Best Actress in a Drama Series:
Tatiana Maslany, 'Orphan Black'

Best Comedy Series:
'Orange Is the New Black'

Best Actress in a Comedy Series:
Julia Louis-Dreyfus, 'Veep'

Best Actor in a Comedy Series:
Jim Parsons, 'The Big Bang Theory'

Best Movie:
'The Normal Heart'

Best Mini-Series:
'Fargo'

Best Actress in a Movie or Mini-Series:
Jessica Lange, 'American Horror Story: Coven'

Best Actor in a Movie or Mini-Series:
Billy Bob Thornton, 'Fargo'

Best Animated Series:
'Archer'

Best Reality Series - Competition:
'Shark Tank'

Best Reality Series:
'Cosmos: A Spacetime Odyssey'

Louis XIII Genius Award:
Ryan Murphy

Best Supporting Actress in a Comedy Series:
(tie)
Allison Janney, 'Mom'
Kate Mulgrew, 'Orange Is the New Black'

Best Supporting Actor in a Comedy Series:
Andre Braugher, 'Brooklyn Nine-Nine'

Best Supporting Actress in a Movie or Mini-Series:
Allison Tolman, 'Fargo'

Best Supporting Actor in a Movie or Mini-Series:
Matt Bomer, 'The Normal Heart'

Best Guest Performer in a Drama Series:
Allison Janney, 'Masters of Sex'

Best Guest Performer in a Comedy Series:
Uzo Aduba, 'Orange Is the New Black'

Best Supporting Actor in a Drama Series:
Aaron Paul, 'Breaking Bad'

Best Supporting Actress in a Drama Series:
Bellamy Young, 'Scandal'

Best Reality Host:
Neil deGrasse Tyson, 'Cosmos: A Spacetime Odyssey'

Best Talk Show:
'The Tonight Show Starring Jimmy Fallon'

Selena Gomez feels "pressure" to behave in a certain way.
The 21-year-old singer-and-actress - who began her career when she was just 10 years old - admits she hasn't already been guided in the right way by her advisers.
She said: "[I'm] surrounded by people who are supposed to guide me -- and some of them have and others haven't. They pressure me, [saying] 'You gotta be sexy, you gotta be cute, you gotta be nice, you gotta be all these things."
The 'Spring Breakers' actress - who recently rekindled her romance with Justin Bieber - is "obsessed" with her work but admits there are some aspects of life in the public eye she dislikes, though she would never complain about her position.
In an interview with ABC News, she said: "I have people saying 'Have fun!' You know, like be able to just enjoy where I am.
"But I want to do a lot, though. I love what I do. I'm obsessed with what I do.
"I've always loved my life. I think there are certain parts of my life I wish I could have to myself and things I could do and grow and experience. But it would almost be just hypocritical of me if I complained about it. I think it's silly sometimes what happens, but I love what I do and I guess I gotta deal with it."

Kate Moss' husband gets "separation anxiety" when they're apart.
Jamie Hince, the supermodel's spouse of nearly three years, admits he hates being away from his wife when he has to go on tour with his rock band, The Kills, or when she's jetting around the globe on modelling assignments.
He is quoted by the Daily Mirror newspaper as saying: "My wife is very much my sidekick, so I tend to get separation anxiety when I'm away from her."
Jamie, 45, says "missing my family" is the hardest part of touring with his band as he can't bear to be away from Kate, 40, her daughter Lila, 11, and their pet dog Archie for too long.
Speaking about the beloved pooch, he gushed: "He came from the deepest, wildest countryside in Italy. He was almost feral. I should've gotten a shelter dog, I know. But Archie was born, he was there and he needed me, so I adopted him."
The musician also opened up about a brutal hand injury that has threatened to end his guitar-playing.
Jamie - who had to completely retrain himself to play his prized instrument - explained: "It's taken its toll on my other fingers and I'm in pain quite a lot after shows. That's my least favourite part of touring now - the physical pain, and missing my family."

Louis Tomlinson wants advice from Sir Elton John after buying his hometown soccer club Doncaster Rovers.
The One Direction hunk, who has gone into business with former chairman John Ryan, admits he needs to "mature a little bit" and is looking to speak to the 'Rocket Man' hitmaker, who became chairman of Watford FC in 1976, to get tips on his new role.
Louis told The Sun newspaper: "I had thought about seeking his advice - but how on earth do you get in touch with Elton John? I don't know. Hopefully this will send the message out!"
The 22-year-old star feels he'll need to start acting "dead serious" and stop being childish, after he was filmed apparently smoking a marijuana-laced cigarette in Peru with bandmate Zayn Malik recently.
He said: "I can't be a big kid any more or play pranks. I am absolutely going to be very involved in the club.
"I will be committing a lot of time to it. I've said that I want to be across absolutely everything.
"I'll definitely be going to board meetings, which is ridiculous, but I guess I am a businessman now."
The pop star asked fellow bandmates Zayn, Harry Styles, Niall Horan and Liam Payne for their blessing before buying the club and dreams of the League One side getting to the Premier League.
Louis recalled: "I said, 'Look boys, I'm going to do this. Do any of you have a problem with it?' All the boys were super-supportive - especially Niall, who is very, very excited.
"I know there will be a few eyebrows raised about me doing this. But hopefully the results go a certain way and we'll create a successful club."
The young star joked that his only experience is playing soccer video games but insists he's up for the challenge and thinks he has what it takes to help the club.
He said: "I still play Football Manager, actually - I absolutely love it! But it's like playing the game for real now."
Louis, who is worth around £14 million, and John, who is a plastic surgery tycoon, have launched a £2 million crowdfunder campaign to ask for help from fans and supporters and will also put their own money into supporting the side.

Joey Essex thought he was going to die in Brazil.
The 'Educating Joey Essex: Football Fever' star was terrified when he was left walking the streets of a favela in just a pair of tiny shorts and was convinced he would be singled out because of his attire.
He said: "I didn't have my hairdryer with me. I didn't have no clothes, nothing.
"They took me to the beach before they took me to the favela so I was in a tiny pair of shorts and I was like 'Thanks, cheers for telling me to pack my overnight bag', and they thought it was funny.
"Everyone in the favela wears trousers. You can see why I was scared.
"It was a lot harder than I thought it was going to be -- at some points, I thought I was going to die."
Joey, 23, was so afraid of the notorious Rocinha favela, he refused to stay overnight as planned.
He said: "I didn't stay in the favela, I got scared. I don't know if it's in the show but I ran out of the home in the favela."
The former 'Only Way Is Essex' star was particularly horrified after he discovered his Rio security team wouldn't accompany him into the slums as they thought it too dangerous.
He told The Sun newspaper: "When we went to the favela, no police or security are allowed near because if they go in the people round there pull out guns and shoot them straight away. But I wasn't going to back out.
"The man I was with said 'The people who have got guns have got really moody faces. He said 'Just don't look at them'."

Ed Sheeran was "wary" of working with Pharrell Williams.
The 23-year-old singer's recent single 'Sing' was produced and co-written by the 'Happy' hitmaker, and it required a different way of working for the British star.
Ed explained: "Working with Pharrell was a different way of writing a song for me. It was completely new but a good way of writing.
"He brought in the bass, hook and the drums and then I wrote all the top line.
"I was wary at first but now I am really happy about that song."
Some of Ed's new album 'x' - which is pronounced 'multiply' - was produced by the legendary Rick Rubin and the 'Drunk' star was determined to "impress" when the producer first expressed an interest in working with him.
He added in an interview with The Sun newspaper: "Rick came in late. He came to gigs and expressed an interest but it was only in August when he invited me around his house in Malibu. I had my guitar with me and he asked me to play and I work best in those situations where you want to impress. He reassessed where I was with the album and came on board.
"He took all the bulls**t away and made me play all the songs as live and kept the raw element to the album."

Danniella Westbrook wants to get married in Liverpool.
The former 'EastEnders' actress, who is engaged to 24-year-old Tom Richards, wants to tie the knot with her beau in the English city after nixing plans to marry abroad.
She said: "I said I wanted to get married abroad, but now I want to get married in Liverpool. It's England's best kept secret!"
Danniella - who recently experienced a heartbreaking miscarriage - admits she isn't interested in an engagement ring from Tom and would rather he splash out on a nice holiday for her and her kids from previous relationships, Kai, 17, and Jodi, 12, whom she had with ex-husband Kevin Jenkins.
She said: "I didn't want a ring. We talked about it and he asked, 'Would you get married again?' and I said, 'Yeah, but don't do the ring thing.' I'd rather go on holiday.
"We were in Spain and he threw me in a freezing swimming pool and then when we came up from under the water, he said, 'Will you marry me?' "
The 40-year-old star has battled cocaine addiction and bipolar disorder in the past, so she insists her family are less shocked about the 16-year age gap between her and Tom.
Daniella told Britain's OK! magazine: "After the things I've put my mum through, an age difference is the last thing that would shock her! And if it's good enough for [former on-screen mum] Barbara Windsor, it's good enough for me!"

Katie Price thinks Mel B's brutal honesty will be "refreshing" on 'The X Factor'.
The glamour model is delighted her good friend will be joining the ITV singing competition's panel this autumn and thinks the straight-talking Spice Girl is going to be the most honest judge to date.
She said: "I like Mel because she says it exactly how it is. There's no beating around the bush or massaging egos. If Mel thinks you're rubbish, she'll tell you. It will be refreshing to hear her comments.
"Personally, I don't think she'll be all about the outfit or style wars like some judges. She'll be more passionate about the talent and concentrating on the contestants."
Katie, 36, who has just dumped her husband Kieran Hayler after discovering he had cheated on her with her best pal Jane Pountney, has no doubt Mel's Scary Spice '90s alter-ego will make a comeback when she's put in the ultra competitive environment.
She explained in her Now magazine column: "Mel will definitely answer Cheryl Cole, Simon Cowell and Louis Walsh back and not put up with any crap. She'll be all out to win it, that's for sure.
"Mel's done brilliantly cutting her teeth on the 'X Factor' Australia and 'America's Got Talent' - so now they're sharpened, she'll be scary with her views."