"Fundamental Friend Dependability" is a song from the the 1972 Peanuts film musical, Snoopy Come Home. It was written by Robert and Richard Sherman and represents one of these songwriters' signature stylistics, the clever word-play song. Other songs they have written using this stylistic include, "Supercalifragilisticexpialidocious" (from Mary Poppins) and "Gratifaction" (from Tom Sawyer. In the song, a strange, hyperactive girl meets Snoopy, decides to name him "Rex" and plays dress-up with him, much to the beagle's chagrin.