Exhibitions in Manhattan and London showcase photos by a rock-and-roll scenester—and pal of John and Yoko’s.

From the Mercer Arts Center chaos of the New York Dolls to John Lennon's New York City T-shirt, the moments that defined a career Transmission 343: Interview with Bob Gruen Bob Gruen has spent decades behind the lens documenting the pulse of music at its most electric and unguarded. His prestigious archive functions as a time capsule of the most iconic musical moments of the New York City skyline; he wasn't just a witness to history, he was a primary visual narrator. Widely regarded as one of the most important music photographers of all time, his portfolio reads like a "Who's Who" of music history.