TWO-time Mercury prize winner PJ Harvey is the headline act announced for this summer’s Green Man Festival.

The singer-songwriter is booked to appear on the Mountain Stage and her act will be the centrepiece performance of the festival traditionally held in mid August at the Glan Usk Estate, near Crickhowell.

This year’s event from August 17 to 20 begins with a yet-to-be announced headline act on the Thursday night.

Baltimore-based trio Future Islands will kick-start the Friday night party with songs from their upcoming album.

While one of the weekend highlights is multi-talented US singer-songwriter, musician, record producer, poet and painter Ryan Adams who is known best for his alt-country music on albums such as Heartbreaker, Cold Roses, Jacksonville City Nights, Easy Tiger, Ashes and Fire and this year’s Prisoner.

This year’s music extravaganza in the shadow of the Black Mountains is also the festival’s 15th birthday.

To celebrate, the festival organisers claim they have put together one of their best ever line-ups.

Besides the three main headline acts, two-time Mercury nominate Michael Kiwanuka returns to the Green Man for the third time. In addition Angel Olsen is also back again following the success of her 2016 album My Woman. While Conor Oberst Ð the man behind the much-loved Bright Eyes - is another notable act already booked.

Other names confirmed are BadBadNotGood, Jon Hopkins (DJ), Field Music, This is the Kit, Julia Jacklin, Fionn Regan, The Big Moon, Richard Dawson, Melt Yourself Down, Hurray For The Riff Raff, Laura Gibson, Sunflower Bean, Chris Forsyth & The Solar Motel Band, Jessica Pratt, Karl Blau, Grumbling Fur, LVL UP, Shame, Wolf People, Big Thief, Gill Landry, Michael Chapman, Doomsquad, Deep Throat Choir, Girl Ray, Gaelynn Lea, Warhaus, The Orielles and "many more acts".

But undoubtedly it is 47-year-old Polly Jean "PJ" Harvey who stands out as this year’s big crowd-puller.

Among the accolades she has received are the 2001 and 2011 Mercury Prize for Stories from the City, Stories from the Sea (2000) and Let England Shake (2011), making her the only artist to have been awarded the prize twice. Other accolades on her CV include eight Brit Award nominations, seven Grammy Award nominations and two further Mercury Prize nominations.

Rolling Stone awarded her 1992’s Best New Artist and Best Singer Songwriter and 1995’s Artist of the Year, and listed Rid of Me, To Bring You My Love and Stories from the City, Stories from the Sea on its 500 Greatest Albums of All Time list. In 2011, she was awarded for Outstanding Contribution To Music at the NME Awards. In June 2013, she was awarded an MBE for services to music.

Green Man organiser Fiona Stewart said: "Green Man 2017 is our big 15th birthday and to celebrate, we’ve bagged some of our most-loved musical heroes. We’re bursting with excitement to unveil the first look at #GreenMan17 and can’t wait to get this extra-special shake-down started! Without further ado...

"We are beyond ecstatic to welcome PJ Harvey to the Mountain Stage. The sheer thought of it is already giving us goosebumps! Having notched up two Mercury Prizes, plus album-after-album of inscrutable beauty, Polly Jean Harvey is an icon of understated, emotive reveries. This is Polly’s only UK show of 2017!!

"This year more than 99 beers and ciders will be available in The Courtyard, the best comedy in Last Laugh, the best festival food in the world (or Wales at least), Einstein’s Garden, the newest and most thought-provoking films in the Cinedrome, as well as tonnes for kids and teens in Little Folk and Somewhere. This year’s festival will be a birthday to remember."

Tickets for this year’s festival are on sale at www.greenman.net.