Glastonbury organisers have apologised after technical problems disrupted the British festival's five-hour ticketed live-stream event.
Coldplay, Haim and Kano were among the acts on the bill for Live At Worthy Farm, which had been due to start at 7pm on Saturday (0400 on Sunday AEST) but was delayed for about two hours.
Some ticketholders reported on social media they were unable to access the stream due to an "invalid codes" error message.
Following the delay, the show's co-promoter and producer, Driift Live, announced it was providing a free link.
It later tweeted to say it was offering those affected in the UK time zone extended access to the stream on Sunday, and would offer a refund for those who required one, with tickets costing STG20 ($A37).
Glastonbury festival organiser Emily Eavis also apologised for the technical issues.
"We will obviously make sure we show the whole film again from tomorrow too and give you the chance to catch up on any bits you missed," she tweeted.
Coldplay delivered an energetic performance from in front of the Pyramid Stage, which included hits such as The Scientist, Viva La Vida and Clocks.
Introducing their song Fix You, he said it was "for all the doctors and nurses, everyone who worked so hard".
Also on the bill, Damon Albarn paid tribute to Afrobeat drummer Tony Allen, who died aged 79 last year.
Radiohead's Thom Yorke and Jonny Greenwood played music from their new project, The Smile.
Mercury Prize-winning band Wolf Alice were the first to perform at the event.
Festival founder Michael Eavis delivered a spoken-word narration before Wolf Alice's performance, which was followed by poet Kae Tempest.
Michael Kiwanuka performed songs Hero and Cold Little Heart, while George Ezra opened with his popular song Blame It On Me.
British musician Kano received plaudits on social media for his performance, with one viewer tweeting: "Alright @glastonbury you redeemed yourself."
Saturday night's show will support Oxfam, Greenpeace and WaterAid, after the full festival was cancelled for a secon year due to the coronavirus pandemic.
Australian Associated Press