The voice of Roger McGuinn was a huge part of the late '60s. The singer/guitarist, who turns 70 July 13, began his career as a backing player and songwriter for hire, but caught his big break when meeting up with Gene Clark to form the Byrds.

As a member of the group, he hit with such favorites as 'Mr. Tambourine Man,' 'Turn, Turn, Turn,' and 'Eight Miles High.' He would also earn accolades for his solo track 'Ballad of Easy Rider.' After the Byrds, he would join Bob Dylan's Rolling Thunder Revue and would enjoy a solo comeback in 1991 with the Tom Petty-penned single 'King of the Hill.'