Johnny Cash on stage with his band, the Tennessee Three, in White Plains, New York, February 1959. The star was photographed by the late Marvin Koner, whose images of Cash are seeing the light of day for the first time after being lost for other 40 years. They form part of an exhibition, 'Johnny Cash: A Definitive Portrait', which takes place at London's Proud Central, July 25 – September 14.