"I Have But One Heart" is a 1945 popular music song composed by Johnny Farrow, with lyrics by Marty Symes.
Sergio Franchi sung it, alone and in a medley with Speak Softly Love, for The Godfather.
This version is on such albums as 20 Magnificent Songs (DynaHouse, 1976) and From My Private Collection - Con Amore (Gold Records, 1976).
"I Have But One Heart" is sung by Johnny Fontane (Al Martino) in The Godfather, during Connie's wedding.
This version plays in the background of The Batman when Bruce Wayne confronts mobster Carmine Falcone.