The 1974 Eurovision winners posted a statement to their official Instagram account, writing "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!"

"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."

❤️

A post shared by @ abbaofficial on Apr 27, 2018 at 4:11am PDT

ABBA have sold over 400 million records, and have only performed together once since 1986.