May I suggest to Mark Yudell and any other pling plong fans to visit
the page of AMMI (Italian Association of Mechanical Music) web site
indicated below, that recently has added a shop section in which,
besides advertising a nice version of the well-known cranked carillon,
offers 20 melodies on carton board already punched.

You can hear them all in full in MP3 audio and get inspired on what
can be done with those 20 notes.  The text is not yet in English but
music is universal.  ;-)

  http://www.ammi-italia.com/negozio/sonetto/sonetto.html 

Kind regards,
Aldo Laus
www.musicaldo.com