I Wanna Hold Your Hand follows a group of teenagers on their way to see The Beatles on "The Ed Sullivan Show" in New York City (Image: Circa Images/GHI/Universal History Archive/Universal Images Group via Getty Images)

They are four superstars that changed the face of music for generations. With number one albums for decades, they are loved the world over. Fans of their music travel across the globe to celebrate their beginnings, and their iconic songs are sung day in day out. They have inspired films and merchandise and have a cultural impact only a few could replicate.

They are, of course, ABBA. Such is the popularity of the Swedish supergroup – who actually broke up in 1982 – a major virtual concert was launched in London 40 years later called ABBA Voyage . The £140m show, whi

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