It sounds like the person Mary Jo Fritsche is looking for, who makes
and sells Symphonion discs, is Barry Johnson.  If not, it should be.
Barry's address (he doesn't seem to have email) is

  Barry Johnson
  1305 Hoover Street
  Menlo Park, CA 94025-4218
  tel.: 650-323-5268

When it comes to used discs, Nancy Fratti in Canastota, N.Y., is
a good source -- as she is in all things music-box.  Her email is
<musicbox@dreamscape.com>.  Kim Bunker <ocpiana@pacbell.net> at
Orange Coast Piano, Santa Ana, Calif., also advertises a stock of
discs for various machines.  There probably are others, but those
are the ones who first come to mind.

Matthew Caulfield (Irondequoit, N.Y.)