"Gentle on My Mind" (1967)
Written by John Hartford and reputedly inspired by the Omar Sharif romantic epic Doctor Zhivago, "Gentle on My Mind” has been recorded more than 300 times by everybody from Frank Sinatra to the Band Perry. Remarkably, however, the definitive version started out as a demo recording with Campbell yelling out instructions between lines. An enterprising producer edited those out and the result is pure magic, a cascading rush of sentiment that's a perfect match for Campbell's voice at its most yearning. After winning four Grammys (two each for Campbell and Hartford), "Gentle" became the theme song for The Glen Campbell Goodtime Hour variety show. No one's gotten tired of it yet.