Barry Gibb is releasing a new album of country covers of Bee Gees songs

Barry Gibb announces new album of country Bee Gees cover duets including Dolly Parton and Olivia Newton-John

It's not everyday you get a line-up of an era's legends all on one stage, but that's exactly what happened one cold January day in 1979. Pictured (L to R) Barry Gibb, Olivia Newton-John, Andy Gibb, Rod Stewart

The day ABBA, Bee Gees, Olivia Newton-John, Rod Stewart and Andy Gibb sang a staggering medley

Barry Gibb and Olivia Newton-John in 2009

When Barry Gibb and Olivia Newton-John sang 'Islands in the Stream' and it was glorious

80s music videos

The 20 greatest music videos from the 1980s

Queen and Olivia Newton John will perform at the charity concert in Australia

Queen and Olivia Newton-John confirmed for Live Aid-style concert for Australian bushfire relief

Billy Ocean, Olivia Newton-John, Elton John and Roger Taylor

Elton John, Olivia Newton-John and Billy Ocean among Queen's New Year's Honours list

John Travolta and Olivia Newton-John

When John Travolta and Olivia Newton-John recreated iconic Grease scene 41 years later

Olivia Newton John is reunited with her jacket

Olivia Newton-John's Grease jacket given back to her by £180k auction-winner

50 of the most valuable vinyl records on the planet - from The Beatles to Queen

50 of the most valuable vinyl records on the planet: from The Beatles and Queen, to Olivia Newton-John

Hugh Jackman pays tribute to Olivia Newton John

Hugh Jackman pays emotional tribute to Olivia Newton-John after cancer update

Grease

Olivia Newton-John is auctioning off her iconic Sandy costume from Grease

Olivia Newton-John with husband John Easterling

Olivia Newton-John's husband gives positive update on her cancer battle

Olivia Newton John

Olivia Newton-John dismisses rumours about her declining health: "I'm doing great"

Olivia Newton-John

Olivia Newton-John is battling cancer for a third time

John Travolta and Olivia Newton John

John Travolta and Olivia Newton-John and the cast of Grease reunite for 40th anniversary

Elton John and Kiki Dee

The top 8 greatest duets of the 1970s, from Elton and Kiki to John and Olivia

Grease deleted scene

Watch how Grease was meant to end with Danny and Sandy kissing, 40 years after it was cut

Grease

Grease 2 was meant to be totally different, and with the original cast