John Lennon once described his wife as the "world's most famous unknown artist. Everybody knows her name but no one knows what she actually does." Well this is no longer the case.
Last week Yoko Ono received a Lifetime Achievement Award in Venice for her art and this week she has been nominated for another lifetime award by the music magazine Mojo.
Sir David spoke to John and Yoko exactly forty years ago this week, soon after their marriage and their second famous "bed-in" for peace.