Yoko Ono’s Meltdown festival

Yoko Ono on why she’s chosen Patti Smith, Marianne Faithfull, Iggy Pop and Boy George to perform at the London festival she’s curating

Into the void

Tate Modern has converted giant former fuel tanks into underground chambers for dance, film and installations

Yoko Ono talks to Simon Schama

She is 79 and still producing the kind of conceptual art that made her infamous in the Sixties. But had she not been Mrs John Lennon, would the world have heard of Yoko Ono? The answer, says Simon Schama, is YES