David Crosby scored a no. 1 hit with his first major recording—but he would’ve had a right to be pissed off about how it went down. That’s because, in January 1965, when the newly formed Byrds went to record a version of Bob Dylan’s then-unreleased “Mr. Tambourine Man,” producer Terry Melcher thought session musicians were needed. Roger McGuinn was allowed to play his jangly guitar part—which would turn out to be the immaculate conception point for Peter Buck’s whole career—and McGuinn, Crosby, and Gene Clark teamed up to sing the vocals. But members of the elite studio team the Wrecking Crew came in to play all the other instrumentation.