In 1961 an IBM 7094 was the first computer to sing

I had no idea!

Evidently HAL 9000 sang Daisy Bell as a tribute, it is the first song ever sung by a computer. In 1961 an IBM 7094 was the first to raise its voice in song.

The vocals were programmed by John Kelly and Carol Lockbaum and accompaniment was programmed by Max Mathews, but the song was written by Harry Dacre, almost a century earlier, in 1892.