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"I Have But One Heart" is a popular song composed by Johnny Farrow, with lyrics by Marty Symes. The song was published in 1945. The recording by Vic Damone, his first release, reached #7 on the Billboard chart.
The song was sung by the character Johnny Fontane played by Al Martino in the film, The Godfather, during Connie's wedding, and was on the soundtrack album to the film.
The song is adapted from the traditional Neapolitan song "O Marenariello." Sergio Franchi used this song, both alone and in a medley with Speak Softly Love from The Godfather. His recorded versions include 20 Magnificent Songs (DynaHouse, 1976), and From My Private Collection - Con Amore (Gold Records, 1976).
The song was recorded in 2008 by Australian singer Alfio for his album Classic Rewinds which pays tribute to Vic Damone, Al Martino and 13 other popular Italian-American singers.