The new single is the third track to be lifted from Voyage, following last month's "I Still Have Faith In You" and "Don’t Shut Me Down".

Björn Ulvaeus says of the new song, "Wikipedia says this track was recorded in September 1978, which sounds about right. That puts it in between ABBA the Album and Voulez-Vous, and it would have been included in the latter had we not decided against it. Why did we decide against it? In hindsight, I don’t have a clue. It’s a good song with great vocals. I know that we played it to a publisher in France and a couple of other people we trusted and as far as I can remember they liked it very much. So it’s a mystery and will remain a mystery."

"Now Benny has recorded a new backing track to which we’ve added drums and guitars, but all vocals are from the original 1978 tracks," Ulvaeus continues. "In a way, it demonstrates what we plan to do with ABBA Voyage in 2022. There, we will have a live band playing, but all vocals will be from the old recordings."

He adds, ""Just a Notion" is a ridiculously happy song and hopefully it will cheer you up in these dark times!"

Voyage will follow the Swedish pop group's 1981 album The Visitors, and the album, which features 10 new songs, was recorded together at Benny’s studio Riksmixningsverket in Stockholm.

Last month ABBA also announced their ABBA Voyage concert, which will see digital versions of Agnetha, Björn, Benny and Anni-Frid perform with a live 10-piece band in a purpose-built, 3,000 capacity arena at the Queen Elizabeth Olympic Park in London from 27 May 2022.

"Just A Notion" is out now. ABBA's Voyage album will be released 5 November via Polydor / Universal Music Group, and is available to pre-order now.