Bob Fitterman is working on an automated scheme to retrieve articles from
the Mechanical Music Digest archives, and he has invited discussion about
the categories of the topics discussed.  Over the weeks that I've been
editing the Digest I've felt that these are recurring topics:

Techniques for Restoration and Repair (How To Do It)
  Music Box
  Piano & Organ

Music Performance:
  How to be a "Pianolist" at your pumper
  How mechanical music is arranged and expression added

Copyright and Licensing

Sources (new and used) for
  Repair Supplies
  Music Rolls & Midi files
  Books
  Audio recordings, CDs

History about (as would be in books)
  Manufacturers and Products and Techniques
  Songs in Society

Computer activities
  Email and Service Providers
  Midi
  Images

Theory about
  Pianos
  Pneumatic Mechanisms (incl. players)
  Electronic Devices

Society news & General News
  MBSI Convention
  AMICA activities
  Books in progress

Value of Goods
  "What's my instrument worth?"

The Mart
  For Sale or Trade
  Wanted (hard goods, not information)

What other categories are there?  What do you think?

Robbie Rhodes