The first computer to sing was the IBM 7094 in 1961.
Why it is true
The IBM 7094, at Bell Labs, was programmed to sing 'Daisy Bell (A Bicycle Built for Two)'. The feat inspired Arthur C. Clarke to include the song in the film '2001: A Space Odyssey', where the computer HAL 9000 sings it while being deactivated.
Source: Computer History
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