I will make this very short and sweet. The Godfather 3 features this moment with Anthony Corleone playing and singing this authentic Sicilian ballad for his father Michael Corleone played by Al Pacino. His daughter Mary and her cousin Vincent also appear in this video. Mary is played by Sofia Coppola and her cousin Vincent is played by Andy Garcia. Michael is reminded of his first wife Appolonia Corleone.
Obviously you must be a fan of the whole Godfather series to associate this very memorable part in the Godfather 3. Did I fail to mention I am a huge fan of the Godfather trilogy?
The lyrics, and the translation are here.