The irresistible song became an international hit and gave ABBA their first UK No.1 single.
With hints of everything that would follow, ABBA’s debut album found the group refining their skills en route to greatness.
After 'SOS' and 'Mamma Mia,' there was renewed interest in an album that had been largely ignored by UK audiences on first release.
The song written by Benny Andersson, Björn Ulvaeus and Stig Anderson had a varied chart history around the world.
One of the group's best-known songs became a US top 40 hit during the American bicentennial.
The Guardian newspaper makes the slightly surprising choice of ABBA's 1975 hit as their best-ever.
The ABBA classic 'Dancing Queen' was elevated to United Nations status last week, as this video and our story explains.