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21 October 2020, 11:47 | Updated: 21 October 2020, 11:55
Sat in a circle on stage, Olivia Newton-John and Andy Gibb sang and chatted with the Swedish supergroup in an informal 'jam session' on TV in the seventies.
The programme was recorded during "ABBA Month" in the States, and the pop group were invited onto the show as special guests. Together they all performed a medley of ABBA hits, including 'Dancing Queen' and 'Fernando'.
But it was the informal "jamming session" that followed which was the really special musical moment.
Between moments of storytelling and conversation, the group slip in and out of music with ease.
Together their harmonies on the Beach Boys' 'Help Me, Rhonda' are faultless, as Olivia taps away on the drums, Benny Andersson plays the piano, Björn Ulvaeus and Andy strum guitars while Anni-Frid Lyngstad shakes a tambourine.
Straight after, the group take on another Beach Boys hit.
"I know one you could start off with your voice," Olivia says to Benny, as she mimics the start of 'Barbara Ann'.
Benny smiles at the group of musicians before singing the opening lines. Moments later, they all join in for a lively cover, chuckling throughout and teasing each other as they try to hit the high notes.
"How come you're doing the high part and I'm doing the low part?" Olivia asks Andy.
Their renditions of pop hits are briefly paused for an operatic performance from Anni-Frid, who showcases her impressive vocal range.
"Do you have any musical sisters or brothers, Andy?" Björn asks Gibb, as the group and audience members erupt in laughter.
"Well I've got a sister," he answers. "No, I have two sisters and three brothers."
"Oh yeah, what are they doing?" someone off camera teases.
"My brothers have got this group together, they've started... I don't know, they've got this album they're trying to... Fever something," he answers, as he pretends to act coy.
Olivia plays along, quipping: "It's not that Fever thing? Oh that'll never take off."
"I keep telling them, they won't listen," Andy replies.
Olivia goes on to ask Andy about his earliest memories of music from growing up in a musical household.
"I don't think I ever really got involved with it that much though until I was about ten or 11," he reveals.
"My brothers were like a generation sort of ahead, so I mean we never really mixed."
He continues to chat about his siblings, adding: "Their music has always been, like you know, the music I've been inspired by."
After Andy finishes talking, the group ease into an early song from the Bee Gees and perform their 1967 hit 'Holiday', with Andy taking on the lead vocals.
The group's 'jamming session' comes to an end with Elvis Presley’s 'Jailhouse Rock'.
"I'm going to really miss you guys when you go back," Olivia tells ABBA. "I've had a really nice time."
She dedicates her final solo of the night to the group and sings a beautiful rendition of 'What'll I Do', as the lights dim and everyone watches on...