On the web site of the Musical Box Society of Great Britain is a
very sparse list of titles of Symphonion 13-5/8" (34.5 cm) discs --
http://www.mbsgb.org.uk/archives/Symphonion13.pdf 

There is also a link to a video of a 13-1/4" (33.5 cm) Symphonion
playing, here -- http://www.mbsgb.org.uk/videos.htm 

If you have any tunes to add to this list (or any others), please
send them to me, or use the form on the web site.

John Farmer, MBSGB