A Rickenbacker 360 12-string guitarPromotional photo of the Byrds in early 1965, L to R: Chris Hillman, Gene Clark, Jim (later Roger) McGuinn, Michael Clarke, David CrosbyProducer Terry Melcher (left) in the recording studio with Gene Clark (center) and David Crosby (right). Melcher brought in session musicians to play on the "Mr. Tambourine Man" single because he felt that the Byrds hadn't yet gelled musically.