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| Music by | Eduardo di Capua & Alfredo Mazzucchi |
| Lyrics by | Giovanni Capurro |
| Date | 1898 |
"O Sole Mio" is a Neapolitan song commonly sung as an opera standard.
Ernie sings a brief off-key rendition in a Sesame Street sketch as a device for learning what time of night it is: the annoyance of his neighbors result in their shouting their discontent down the street. Oscar also briefly sings it as he showers in Episode 0141, and Rafael sings a sample in Episode 0330.