When people think about Mister Ed, the first thing they remember (other than the talking horse) is the catchy theme song. The classic song was written by the legendary writing team of Jay Livingston and Ray Evans who scored many movies and television shows.
When they finished the song, Mr. Livingston recorded a demo to play to the Mister Ed producers to see what they thought. They absolutely loved it and decided to use the demo itself instead of recording a new version. Mr. Livingston's voice became a part of television history.