Which greatest song of all time was number one in 1977?

This 1976 song is considered the most successful of the 1970s and also one of the greatest songs of all time.

It was one of the most internationally acclaimed number one songs when it topped 25 international music charts at number one almost simultaneously.

It has been professionally covered by almost 100 other artists and is still played on radios and in discos today.

Do you know which Swedish hit this is?

Listen to “Dancing Queen” by Abba below!