Here is a response from Mark Labancz.  He has given me his permission to
forward his message to the MMD.  Anyone else have anything to add?

Sam Harris - Greenville, North Carolina
http://www.geocities.com/anneharris1/

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Hi there.  Saw your inquiry on MMD.  I bought these 3 cassettes way
back in 1975 and had them up until last year when I sold them on eBay.

They brought me many hours of listening pleasure.  If I remember
correctly, they were recorded on a "J. C. Fischer" Piano.  Some of
the tunes were recorded prior to it being properly tuned, and then some
after tuning.

Mark Labancz