The one you stole from the sky and placed in your own eye... what else? Or perhaps it's merely a reflection.
Actually, this downtempo duet is considered a standard; written in 4/4 time it has music by Burton Lane with lyrics by E.Y. Harburg like all the other songs in Finian's Rainbow. It is the 4th song in the show (excluding the overture), and is performed by the characters Woody Mahoney and Sharon McLonergan.
Suggestion credit: Alexander Baron - London, England
The most popular rendition of this song was by Frank Sinatra, who included it on his 1956 Capitol Records release Songs for Swingin' Lovers!. Ella Fitzgerald, Tony Bennett, Chet Baker and Lena Horne. Miles Davis recorded a popular instrumental version in 1954.