>First step:  Before starting that project, he would like to know if
>there are already videos on the market (worldwide) about that theme.

I've never seen anything like it.  There are a couple of old movies that
have mechanical music devices _in_ them -- plot devices or "window-
dressing" only -- but no documentary-type films that I have ever heard
of.  Boy, would I love to see a good film or video about music boxes.
I'd buy it on the spot.

One suggestion: because most TV's in this day and age still have crappy
sound, I'd suggest he make an accompanying CD with the music from the
video.

regards,¶
Larry Smith