ABBA's Björn Ulvaeus announces when their five NEW songs will be released!

ABBA fans received a special treat over weekend when half of the pop supergroup reunited at the launch of the spectacular pop-up restaurant Mamma Mia! The Party at London's O2.

During the appearance, Björn Ulvaeus who was at the opening with his bandmate Benny Andersson, revealed that ABBA has five new songs on the way!

However, ABBA fans will have to wait a bit longer, as the new music - which was meant to be released last year - won't come out until next year now, due to technical difficulties.

Speaking about the songs, he said: "It was really quite amazing, being back in the studio. Like we never left.

"Although I’m not telling you when those new songs will be released because we’ve already missed too many dates."

He added: "I won't promise any date … the other three don't want me to say anything about this."

So will the new songs bring with them a new sound?

Björn explained: "No, it's definitely ABBA sound. That hadn't gone. The minute the two ladies started singing together in the studio, ah, there it was! The same sound.

"It's slightly lower now because everyone [has dropped] in range. But the sound is the same and yeah, it's going to sound like ABBA, definitely.

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"One of the songs is more timeless, not of a certain style. The other one is perhaps a little nod to the 70s, but with modern-sounding instruments."

The 74-year-old went on to reveal how the group - which also includes Agnetha Fältskog and Anni-Frid Lyngstad - came to reunite, saying: "We were approached by Simon Fuller, the man behind Spice Girls. He had an idea about creating digital copies of ABBA because he lives in LA and had seen something happening there which would be interesting.

"He approached us and we thought, 'Yeah, that's crazy enough, that's interesting and it's a new frontier, something no one has ever done before'. So we said, 'Absolutely, yes! Let's see what happens. Let's try and make a project out of it'.

"Then Benny and I thought, 'These ABBAtars, for want of a better word, shouldn't they have something new to sing as well? Well, yes!' So we wrote a couple of new songs, we called the ladies and they said, 'Yeah, great! Let's meet in the studio and see if we still can sing! If it sounds bad, we won't release it, we'll just have fun in the studio'."

The recording session marked the first time ABBA had back in the studio together in almost 36 years, but Björn noted the band felt at home within seconds.

Björn continued: "The situation was so familiar. We'd been doing that so many times during the '70s so everything just came rushing back and it was like we had met yesterday. Incredible feeling!

"Although, we knew it was 36 years ago or something, an enormous amount of time, and yet we felt that, I think it's because of the bonds we have between us and the friendships."