It's a reunion that many people ruled out, but the four members of one of the greatest pop bands of all time, ABBA, sang together in public for the first time in 30 years over the weekend.

Alright - 'reunion' might be stretching it a little, but Bjorn, Benny, Agnetha and Anna-Frid appeared at a gala to mark 50 years since founding members Bjorn Ulvaeus and Benny Andersson met for the first time in Stockholm on Sunday night.

During the event, Agnetha and Anna-Frid recited the lyrics of their 1980 song 'Me and I', report Expressen, before the two men unexpectedly joined in to complete the reunion.

Although the four members have appeared together in public over the years - most recently opening an ABBA-themed restaurant in Stockholm - they have been adamant that they would not get back together after splitting in 1982.

Video footage has yet to emerge of their impromptu reunion, but you can see photos below: