Which song does Al Martino perform as Johnny Fontane in The Godfather?

In The Godfather, Al Martino performs “I Have But One Heart” as Johnny Fontane.

Fontane sings the romantic song at Connie Corleone’s wedding reception while guests celebrate outside the Corleone home. The performance introduces Fontane as a popular singer and as Vito Corleone’s godson.

The song is an English-language adaptation of the Italian song “Un cuore solo.” It became closely associated with the film because it appears during the opening wedding sequence, before the main criminal conflict develops.

The song is sometimes confused with “Speak Softly, Love,” the theme associated with The Godfather. “Speak Softly, Love” was written for the score and is not the song Fontane performs at the wedding.