This is one of my boxes playing "Bells of Cornville". It's a 27" changer holding 12 discs. After each disc is played, the disc is dropped back into the rack, the rack advances and the changing calipers pick up the next disc for play.
This is an 8 tune, 13" cylinder Mermod Freres cylinder box. It has six bells truck by Mandarin strikers. It is a loud music box so some of the bell notes seem off but these are only overtones.
I had this case made for an "orphaned" Polyphon mechanism. The cabinet maker used spruce for the sound board plus a maple post to transmit the vibrations from the bedplate.