From wikipedia :
""The Meow Mix Theme" was written by Shelley Palmer in 1970 and performed by a singing cat. The idea came from Ron Travisano, at the advertising agency of Della Femina Travisano and Partners, who had the account with Ralston Purina in 1974. Travisano put together film footage with editor Jay Gold, looping images of a cat to make it look like it was singing. The music was then composed by Tom McFaul of the jingle house Lucas/McFaul, one of the major jingle-composing houses at the time. Working from Travisano's film, McFaul wrote and produced music to fit, with the actual meowing performed by professional singer Linda November.[3][4]
Travisano then came up with the idea of adding English subtitles, along with a bouncing ball pointing out the words.[5]"
