This band is no joke. ABBA knocked ‘Bohemian Rhapsody’ off the top of the charts in 1976 with Mamma Mia and on that same year today they scored their third UK No.1 single with Fernando, their best selling single with sales over 10 million. They later became one of the most profitable business in Sweden, second only to Volvo.

On this throwback of the Swedish pop wonders, we have a look at the life and fame of the two couples through our archive photos. Did you know they wore those outfits as a tax write-off because the Swedish government allowed costumes to be tax deductible if they couldn’t possibly be worn on the street?