Bowie was not really supposed to play Glastonbury in 2000, but due to a gamble from his publicist, the Starman singer wound up headlining.
Organisers have warned there will be fewer tickets up for grabs than previous years.
1971 was the first year of the Pyramid Stage and the price of entry was literally unbeatable.
The likes of Dua Lipa, Coldplay, Shania Twain and SZA will headline this year’s festival.
Here's how James Blunt "secured his place as the least cool musician to have ever existed, or played at Glastonbury."
Madonna was one of three acts reported to have signed up to headline the festival in 2024.
The ticket sale has been pushed back to "ensure that everyone who would like to buy a ticket is registered and therefore eligible to purchase one".
About Glastonbury
Glastonbury is one of the longest running musical festivals in the UK, with revelers descending on Michael Eavis' Worthy Farm in Pilton, Somerset, nearly every year since 1970. Many of music's biggest names have played the festival over the years, including David Bowie, Beyonce, The Rolling Stones, Oasis, Blur, Amy Winehouse, The Killers, Coldplay, Arctic Monkeys and Kanye West. 2016 saw Adele headline the famous Pyramid Stage for the first time, alongside Coldplay and Muse. Radiohead, Ed Sheeran and Foo Fighters have been confirmed as 2017's headliners, topping the bill on the Pyramid Stage. Other performers include Katy Perry, Stormzy, The XX and Lorde. The festival will take a break in 2018, and return in 2019 at a new location in the Midlands, where it will be called the Variety Bazaar. Glastonbury will then resume as normal in 2020.