Celebrating 40 years of ABBA's 'Does Your Mother Know': Watch their live performance of the song

In 1979, ABBA were on top of the world.

So to celebrate its 40th anniversary this year, we are throwing it back to when ABBA experimented with their winning formula and fans were treated to the rare moment Björn Ulvaeus took the lead vocal for 'Does Your Mother Know'. 

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The song - which was released on 27 April 1979 as the second single from the album Voulez-Vous - is a Rod Stewart-inspired glam-pop track that has a crackling energy.

ABBA's live performance of the song on the Spanish TV show, 300 Millones, is one of our favourite clips - enjoy!