<HTML>Elian, A little late was also my first thought.  She is asking questions for which the answers would fill volumes.  I recall you being one of the people who wanted me removed from this list a few years ago because of this very subject.  Don't try to tell me it didn't have anything to do with that because I know it had anything and everything to do with it. I always said that these questions would not go away and neither would I.  I've seen scores of people brush this subject off as being something completely irrelevant to their work.  But now comes the emergency.  What is all of this all about? I still offer you humbly, my website.  It is a place for many in depth articles on these kinds of questions.  She should read the first three chapters on History of Tuning and the definition of Well Tempered tuning.  The article on Key Color would also be helpful. The pure, plain and simple answer to the question of what an "unequal temperament" is, any temperament which contains any kind of equality whatsoever. I wish the student luck in getting a grasp on this by tomorrow. Bill Bremmer RPT Madison, Wisconsin <A HREF="http://www.billbremmer.com/">Click here: -=w w w . b i l l b r e m m e r . c o m =-</A></HTML>