@Smersh Hal 9000 (or 'Hal') sings Daisy Bell in 2001: A Space Odyssey as a parting gesture to show his human counterpart, Dave, that he has come to understand and appreciate human behavior and emotions. The song was chosen by Stanley Kubrick because it was one of the first computerized vocals ever created. It was originally written in 1892 and was used in a popular experimental music technology demonstration in 1961.