A huge hit for Peter, Paul & Mary in 1967, "Leaving on a Jet Plane" was written by a very young John Denver, who was then a member of the Chad Mitchell Trio before beginning his illustrious solo career in the 1970s. A bittersweet, gentle melody guides the song, with a strong shading of Kingston Trio-inspired, traditional chord patterns. But lyrically is where the song really shines. A direct and heartfelt statement about a musician ready to leave town and his loved one, there is a sense of regret and longing that permeate every line in this minor classic. The vocal arrangement is positively sterling, with Mary Travers delivering one of her finest performances of her career.