What is the earliest recording of a computer-synthesized voice singing a song?

The earliest recording of a computer-synthesized voice singing a song is "Daisy Bell (Bicycle Built for Two)" sung by the IBM 704 computer in 1961. Here are the steps leading to this event:

1. In the late 1950s and early 1960s, the IBM 704 became the first mass-produced computer with floating-point arithmetic hardware. It was used in many high-profile scientific projects.

2. In 1961, physicist John Larry Kelly, Jr, a researcher at Bell Labs, programmed the IBM 704 to sing "Daisy Bell" in the earliest demonstration of computer speech synthesis.

3. Kelly's programming of the IBM 704 to sing was notably used in Arthur C. Clarke's 1968 novel and Stanley Kubrick's film 2001: A Space Odyssey, in which the HAL 9000 computer sings "Daisy Bell" during its gradual deactivation.

4. The song "Daisy Bell" was composed by Harry Dacre in 1892. The specific rendition by the IBM 704 was in a musical, almost human-like voice, which was a significant achievement in the field of speech synthesis at the time.

5. This event marked a significant milestone in the development of computer speech synthesis, which has since evolved into the sophisticated voice recognition and synthesis technologies we have today.