Jim,  I picked up a copy too, in a recent UK roll auction, out of sheer
curiosity.  You got a bargain.  I paid GBP1.50, about $2.50.  Mine was
in poor condition too, with a badly torn leader and some edge damage.
I suspect that a musical switch was a Victorian entertainment, in the
"name that tune" style, that lived on into the 20th century.  Just a
wild guess.

Jeffrey Borinsky