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Re:System Bus Radio: Transmits AM radio on computers without... by braythwayt on Wednesday January 17, 2018 @09:46AM (#16168237)
I seem to recall reading about this running on minicomputers or mainframes, as described in another reply, and I also think this predated the Altair, as I first became smitten with computers around 1972.

Here's a video of a minicomputer generating AM radio music in 1971:

https://www.youtube.com/watch?v=akvSE5Z474c&lc=D5Mdy7u7Cxwsk...

Re:System Bus Radio: Transmits AM radio on computers without... by univacky on Wednesday January 17, 2018 @10:06AM (#16168435)
I think that computer was built in 1971; the video mentions that the software used is Richard Wilson's player, which was written in 1975 (the DECUS entry is dated 2/11/1976).