Changed tag as well

>Or you could do the same thing, but punch holes in opaque
>paper.  Now where have I seen that idea before...

The best examples I have come across are in the Transport Museum, Sinsheim,
Germany. About 30 minutes drive south of Heidelberg IIRC. There is something
like a half dozen fairground organs spread around the museum, and each one
has a set of 5 or 6 tunes in its punch card loop, with each organ set up
with a different set of tunes. Each organ had a coin slot to turn it on for
one tune. If you stay long enough to hear all the tunes, you were there for
a very long time.

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