Forty years after the release of their last studio album, ABBA have said that they will "definitely" release new music this year.

After several years of speculation and delays, 76-year-old Björn Ulvaeus, who was a member the Swedish supergroup with Benny Andersson, Agnetha Fältskog, and Frida Lyndstad, said, "There will be new music this year, that is definite, it's not a case anymore of it might happen, it will happen."

Watch: Björn and Benny talk to RTÉ Enterttainment

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It will be the first new music since the band's The Visitors album in 1981 and their final single in 1983, an A-side re-release of Thank You For The Music.

Speaking to The Herald Sun, Ulvaeus added, "We're really, really good friends. The four of us stand in the studio for the first time in 40 years and there's just something in knowing what we've been through. It's hard to describe, but there are such strong, strong bonds between us."

ABBA confirmed in 2018 they were planning to record new tracks for the first time in 35 years, and it has now been revealed they have more songs than originally planned.

However, the band have had to delay the releases - which includes much-anticipated tracks I Still Have Faith In You and Don't Shut Me Down - as well as their ABBAtar hologram tour, due to the Covid-19 pandemic.

The group split in 1982 and performed together for the first time in decades in 2016 at a private event, which marked the 50th anniversary of the first meeting between songwriters Bjorn and Benny.

The band have not said whether the new music will be a complete album or individual songs, and there is no release date set.

Benny Anderson at Dublin Airport, November, 1979

ABBA, who shot to fame after winning the Eurovision Song Contest in 1974 with their song Waterloo, played their one and only Irish concert at the RDS in 1979.

The band played the last gig of their European tour at the Dublin venue on November 15th, 1979 with a set that included Voulez-Vous, Knowing Me, Knowing You, and Chiquitita. The band stayed at the Gresham Hotel in the city that night.

Speaking to RTÉ Entertainment in 2018, Andersson recalled: "It felt good to be in Ireland and we opened the show with me playing a Swedish folk tune on my GX-1 Yamaha keyboard and that felt especially good in Ireland because it connects, Irish folk music, Swedish folk music.

Björn arriving at Dublin Airport, November 1979. Picture: RTÉ Archives

"I remember some of the people in the crew weren't that sober that night during the performance, that’s what I remember. Someone came on playing the accordion in the middle of the song."

"We toured very little," said Ulvaeus. "I think we did Dublin after Glasgow and funnily enough the other day when I looked at Trump and his golf course in Scotland, there was a picture of that building, the clubhouse and that's where we stayed with ABBA on tour before we went by helicopter over to Dublin and hence that lyric `when I called you last night from Glasgow' on Super Trouper."