If you want Japanese music on piano roll, you need look no further
than Yamaha's own production!  There was a fairly substantial article
about their factory in the Music Trade Review (MTR) in 1920, and this
included a description of how many player pianos they'd made that year
(I forget, but it wasn't that many).  The article also said they made
rolls with a perforator their engineers had built themselves.  I'd
heard vague rumours about all this, and it was interesting to see it
in a primary source.

I've seen one or two of these rolls in the UK, from a collector friend.
They are standard 88-note rolls, carrying the same trademark on the
leader that Yamaha pianos carry to this day.  The music is definitely
Japanese, not obviously a candidate for making a piano roll of!  From
the MTR article, we can presume these are Japanese products, not rolls
made to order in America.

Oddly, Yamaha make no mention of their production of pneumatic player
pianos in their product timeline.  I wonder how many were made, and how
many survive?

Julian Dyer