The file
A jingle with exactly one word in it, sung by a cat. The joke of the campaign was that the cat was asking for the food by name, and the tune was catchy enough that people sang the meows in the car.
It ran for decades in various forms and is one of the few jingles that is technically lyric-free, which is why we can tell you the whole thing: it's meow.
Sources: Wikipedia — Meow Mix
