<Table> <Tr> <Td> "Day Is Done" (1969) </Td> <Td> "Leaving on a Jet Plane" (1969) </Td> <Td> "The Marvelous Toy" (1969) </Td> </Tr> </Table> <Tr> <Td> "Day Is Done" (1969) </Td> <Td> "Leaving on a Jet Plane" (1969) </Td> <Td> "The Marvelous Toy" (1969) </Td> </Tr> <P> "Leaving on a Jet Plane" is a song written by John Denver in 1966 and most famously recorded by Peter, Paul and Mary . The original title of the song was "Babe, I Hate to Go", as featured on his 1966 studio album John Denver Sings, but Denver's then producer Milt Okun convinced him to change the title . Peter, Paul and Mary recorded the song for their 1967 Album 1700 but only released it as a single in 1969 . </P> <P> It turned out to be Peter, Paul and Mary's biggest (and final) hit, becoming their only No. 1 on the Billboard Hot 100 chart in the United States . The song also spent three weeks atop the easy listening chart and was used in commercials for United Airlines in the late 1970s . The song also topped the charts in Canada, and reached No. 2 in both the UK Singles Chart and Irish Singles Chart in February 1970 . </P>

Who sings the song leaving on a jet plane