Pop legends Abba are set to release an unheard demo on a deluxe edition of their final album, 'The Visitors'.

The unreleased track, 'From A Twinkling Star To A Passing Angel', marks the first time the Swedish band have delved into their archives since 1994.

A statement called the track, which was recorded at the peak of Abba's career, a "sensational inclusion".

'The Visitors' was originally released in 1981, a year before the band split," the BBC reported.

The new edition is due for release in April.

"This is the first time since the 'Thank You For The Music' box set in 1994 that Abba have opened the doors to the tape vaults to release previously unheard music from the group's heyday," a statement said.

The album will also feature bonus selections and a DVD of rare and previously unreleased material from the archives. (ANI)