ABBA was a Swedish pop group formed in Stockholm in 1972, comprising Agnetha Fältskog, Björn Ulvaeus, Benny Andersson, and Anni-Frid Lyngstad.
ABBA are set to release their first new song in 18 years
The Swedish group will release a previously unreleased track on the upcoming deluxe edition of their final 1981 album 'The Visitors'.
'From a Twinkling Star to a Passing Angel' - a previously unheard demo - is described as a "demo medley" on the band's website, and will mark the first previously unreleased ABBA music since 1994.
ABBA's popularity has enjoyed a resurgence in recent years, buoyed by stage and big screen versions of the musical 'Mamma Mia!', which is based on the group's songs.
The band formed in Stockholm in 1972 and have sold over 200 million records worldwide.
Though they never officially broke up, ABBA last performed together as a group in 1982, and members have stated that they don't intend to officially reunite.
The album will be released in April.