YouTube would seem to have been made for mechanical music devices, but
I guess it's hard to get to the insides of the instruments when you're
at the Great Dorset Steam Fair.  If it was possible, it would have been
fun to watch the mechanisms working away, but I suppose they're not so
accessible.  The music was excellent, though.

Whilst looking at those videos, I found this one, where someone managed
to program some rock music onto one of the stately old instruments.
It's lots of fun.

http://www.youtube.com/watch?v=syDIIJW32RA&mode=related&search=

Mark Kinsler
Lancaster, Ohio USA
http://www.mkinsler.com/