TOPSHOTS Storm clouds gather on the first official day of the Glastonbury Festival of Music and Performing Arts in Somerset, southwest England, on June 27, 2014. US metal giants Metallica will play this year's coveted Saturday night headline spot at Britain's Glastonbury festival, organisers announced Thursday. It will be the "Master of Puppets" four-piece's first appearance at the legendary festival, held in south west England, following on from The Rolling Stones' Worthy Farm debut last year. AFP PHOTO / LEON NEAL