Adriano Celentano - Prisencolinensinainciusol

It comes up whenever threads touch on fake languages, accents, or gibberish that sounds plausible, and commenters like sharing it with people who haven't heard it.

A 1972 song by Adriano Celentano whose lyrics are nonsense syllables designed to sound like American English to non-English speakers. It is a rock and rap-flavored novelty track with a video.