One of the most popular 1960s sitcoms, Mr. Ed might attribute much of its success to its memorable theme song. Even if you're just a casual fan of the show, chances are you can recite the tongue-twisting lyrics of "Mister Ed" in your sleep.

The theme was composed by Jay Livingston and Ray Evans, so it's no surprise that the song caught on. Livingston and Evans were life-long collaborators and the best in the business at the time, with three Oscar-winning credits for "Buttons and Bows", "Mona Lisa", and "Que Sera, Sera" (Doris Day's big hit), as well as the TV theme music to Bonanza.

The first six Mister Ed episodes have theme song music only, and no lyrics, as the actor who did Mr. Ed's voice (Rocky Lane) couldn't sing. Eventually Jay Livingston ended up also singing the theme song for the show. Even the deep "I am Mister Ed" at the end of the song was done by Livingston, with added reverb.

The song lyrics can be found under A Horse is a Horse.