[Ref. Scott Reisfield in 180726 MMDigest]

Scott Reisfield may be better off looking into the do-it-yourself
20-note music box movements that use the paper strips you punch
yourself.  These movements are not chromatic, so some "creativity"
may need to be exercised in creating the arrangements.  One source
can be found at

https://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=B076YX25QX 

For some songs the smaller 15-note movement may be a possibility, but
it may require even more compromises in the arranging:

https://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=B076SVFF68 

Importantly, if Scott intends to arrange songs that are (still) under
copyright, he must obtain permission from the copyright holder (or a
mechanical license) to make the arrangement, particularly if he intends
to sell these movements.

I know from experience that trying to get a movement manufacturer
such as Sankyo or Yunsheng to make a movement for a song that is not
currently "in stock" will be a frustrating and probably very expensive
process.

John Grant