Adele will be saying Hello to Glastonbury's Pyramid Stage for the first time as she makes her debut at the festival.
The Skyfall singer has previously explained that she is scared by the size of the crowds at Glastonbury, so it was a surprise for many fans when she announced that she had agreed to the Saturday headline slot.
The 28-year-old will belt out her hit songs underneath the Aladdin Sane stripe, which is suspended over the Pyramid Stage as a tribute to David Bowie.
There will be a further tribute to the late music icon immediately afterwards, when Bowie will be celebrated with the festival's first ever classical music headliner.
American composer Philip Glass's Heroes Symphony, written in homage to Bowie's 1977 album Heroes, will be brought to life with an immersive laser performance by Chris Levine on the Park Stage.
Starting just before midnight and straight after Adele's set finishes, Charles Hazlewood will direct a classical orchestra featuring Army of Generals and members of the British Paraorchestra for "a 45-minute symphonic meditation" inspired by Bowie's album.
Festival organiser Emily Eavis has said: "Bowie's performance of Heroes in his 2000 Pyramid set was one of the all-time moments in our history and it just feels so right that we will relive it again on Saturday night through the brilliance of Philip Glass's symphony."
The Lewisham and Greenwich NHS Choir will kick off the day's musical performances on the Pyramid Stage, exactly six months on from their Christmas number one triumph.
The choir beat singers including Justin Bieber to claim the top spot with their single A Bridge Over You.
Festival-goers will be hoping avoid any more downpours, but forecasters say Glastonbury will witness a mix of sunshine and showers, with the chance of some heavy rain and thunder as the day goes on.
This should clear towards the evening to reveal drier weather for the headline acts, with temperatures around 18C.