Chart-topper You're The One That I Want is revealed today as the biggest selling duet of all time - more than 30 years after it was a hit.
And Olivia Newton-John and John Travolta, who sang the track, pulled off a double feat with their other hit, Summer Nights, placed second.
The chart of all-time best-selling duets will be counted down in in a Radio 2 special from noon today by Tony Blackburn.
Newton-John and Travolta's hits were both recorded for 1978 blockbuster movie Grease.
Compiled for the station by the Official Chart Company, the chart contains some surprises with novelty hit Whispering Grass by It Ain't Half Hot Mum stars Windsor Davies and Don Estelle at number six.
The top 5 is:
1. John Travolta/Olivia Newton-John - You're The One That I Want.
2. John Travolta/Olivia Newton-John - Summer Nights.
3. Puff Daddy/Faith Evans - I'll Be Missing You.
4. Jason Donovan/Kylie Minogue - Especially For You.
5. Elton John/Kiki Dee - Don't Go Breaking My Heart. - Belfast Telegraph