Over the last fifty years or so there have been at least three
electronic player organs of which I'm aware: Gulbransen, Hammond, and
Wurlitzer.  To the best of my knowledge, all three used a standard piano
nine-to-the-inch tracker bar.

My question is: Did these companies also produce music rolls arranged
for their instruments, and if so, are there any still around?  If anyone
has any such rolls, I would certainly like to try them out to see how
they sound on my player organ.

Tom Hutchinson