Swedish pop legends Abba performed on stage together for the first time in more than 30 years.
The performance at a private gala in Stockholm on Sunday marked 50 years since songwriting duo Bjorn Ulvaeus and Benny Anderson met for the first time.
They were joined by Agnetha Faltskog and Anni-Frid Lyngstad and an impromptu performance of 1980 hit Me and I followed.
Footage of the surprise singalong has not surfaced but pictures appeared online.
It is the first time the group has performed publicly since they split in 1982.
“It’s been a great night,” Mr Andersson told Sweden’s Expressen newspaper.
“It was absolutely amazing - a lot of emotions,” agreed singer Anni-Frid Lyngstad.
“We’ve made this journey throughout our history. Benny and Bjorn in particular. It’s been very nostalgic.”
Abba shot to fame with victory in the 1974 Eurovision song contest with Waterloo.
They went on to sell almost 400 million albums around the world and their songs were used in the hit musical Mamma Mia! which was later turned into a film starring Meryl Streep.
The band started out as two married couples, and continued performing despite their respective divorces. ABBA permanently split-up in 1982.
Abba's greatest hits