This a clever bit of programing here from 1970
and here
I’ve heard of people doing something like this, but this is the first time I’ve seen it done. Very cool!
And if you have real PDP 8 the software is here.
https://tangentsoft.com/pidp8i/doc/release/src/music/README.md
I remember hearing the classic story about someone from the west coast home brew computer club getting some machine to play Daisy, like HAL sang in 2001 as he was being shut down.