"If I Only Had a Heart" was a song from "an old Earth movie", The Wizard of Oz, which Ira Graves referenced when he met Data. As Data did not understand, Graves explained how the song was an allegory for Data's own predicament: "A mechanical man wants a heart but learns that he was Human and had one all along." (TNG: "The Schizoid Man" ) The Star Trek Encyclopedia (4th ed., vol. 1, p. 357) identified the song as "If I Only Had a Brain". This was the song sung by the Scarecrow.