Posting a statement on the official ABBA Instagram account, the band wrote: "The decision to go ahead with the exciting ABBA avatar tour project had an unexpected consequence.
"We all four felt that, after some 35 years, it could be fun to join forces again and go into the recording studio. So we did. And it was like time had stood still and that we had only been away on a short holiday. An extremely joyful experience!"
They continued: "It resulted in two new songs and one of them 'I Still Have Fair In You' will be performed by our digital selves in a TV special produced by NBC and the BBC aimed for broadcasting in December.
"We may have come of age, but the song is new. And it feels good.
"Agnetha, Benny, Bjorn, Anni-Frid - Stockholm, Sweden, 27 April 2018."
The group's manager Gorel Hanser also confirmed the news in a press release.
During a speech in Brussels on 25 April, singer Bjorn Ulvaeus, 72, revealed that virtual "Abbatars" are being created to represent the four members of the pop group of the upcoming digital tour, expected for 2019 or 2020.
They will be pictured as they looked during the height of their fame, with Ulvaeus saying: "We thought we looked good that year."
"They photographed us from all possible angles, they made us grimace in front of cameras, they painted dots on our faces, they measured our heads," he told broadcasting executives last week.
"Apparently a cranium doesn't change with age the way the rest of your body falls apart."
ABBA have sold more than 400m albums in their career and have enjoyed nine No.1 hits in the UK between 1974 and 1980 - but have not performed since 1986, other than a brief appearance at a private party in 2016.
The Independent
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