In reply to Bill Chapman in the 140118 MMDigest.  If your friend's son
has a computer and web access, he can probably play MIDI files.  Frank
Himpsl has a wonderful, large collection of MIDI files from player
piano rolls of the period.  It can be accessed at http://frankhimpslarchive.com 

David Sharpe
Normally in Western MA, but in sunny FL for another week