One day in 1970, the Californian artist John Baldessari looked back over the ... His gallerist, Marian Goodman, tells the BBC: "He gave a great deal to his students - a great deal.

According to Garfunkel, Lennon pulled him aside amidst a get together with the former Beatle, Yoko Ono, and David Bowie. Despite having his partner and a longtime friend there, Lennon opted to ask ...