Here they go again: ABBA reunite for first new album in 40 years

Swedish pop group Abba: Benny Andersson, Anni-Frid Lyngstad, Agnetha Faltskog and Bjorn Ulvaeus pose after winning the Swedish branch of the Eurovision Song Contest with their song "Waterloo" (Olle Lindeborg)

Swedish supergroup ABBA announced their first new album in four decades on Thursday and said they would stage a series of virtual concerts using digital avatars of themselves in London next year.

Fans piled online to celebrate the long-awaited reunion of one of the world's most successful bands. "2021 has been saved by new ABBA music," @elliemiles23 said in one widely shared Twitter post.