Gregor Piatigorsky, 1 ?006 TopFoto/Ken Russell Photo by Ken Russell, 1956 Ken Russell was the only photographer at the final rehearsal of the British premiere of William Walton's cello concerto, conducted by Sir Malcolm Sargent. From the original caption: "Grigory Piatigorsky is among the world's best cello players. He is in Britain, from his home in America, to play the Walton Cello Concerto before Queen Elizabeth the Queen Mother. His cello is a Stradivarius worth $100,000".