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For many years Yoko Ono was derided as the woman who broke up The Beatles by marrying John Lennon and "taking him away" from the band.

People made fun of her singing and her art.

These days though, attitudes have changed.

Now in her nineties she's widely recognised as a ground-breaking and influential artist.

A major exhibition celebrating her life's work has just opened at the Tate Modern Gallery in London.