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weinzierl
Click on the links of the exhibits and they sometimes have the original brochures and manuals for download. Sometimes even ROM images. Neat!

EDIT: The collection of PDP8 documentation is quite comprehensive [1]. The subfolder music caught my eye. There is a brochure about PDP-8 that was combined with a Tektronix display and a Schober organ to produce a written record of the music as played on the organ[2].

[1] http://bitsavers.informatik.uni-stuttgart.de/pdf/dec/pdp8/

[2] http://bitsavers.informatik.uni-stuttgart.de/pdf/dec/pdp8/mu...

preek
When I was studying at the University of Stuttgart, I once saw a demonstration where they were playing music over a regular radio by running a program on one of the old fridge size computers (can't remember which). The radio waves were just a side effect of it's vacuum tubes. It was a pretty neat trick, imho^^
gregwtmtno
You used to be able to do this by showing certain images on a CRT. It was cool trick back in the day.
JNRowe
Tempest for Eliza¹ was doing the rounds some years ago. I'm sure there were other implementations in the wild, but I can't remember their names.

1. http://www.erikyyy.de/tempest/

gregwtmtno
Yup! That's the one I remembered. On a side note, I wish they still made sites that look like that one.
ido
this was also the way to generate audio in old trs80 games (the Model-I had terrible RF shielding).