Greetings, Historically, Mozart may have been surrounded by the latter days of meantone, or the earlier days of Well Temperament. I have had it pointed out to me that everything he composed for the keyboard stays in the six or seven of the simplest keys, thus, a 1/6 comma meantone would provide the maximum amount of consonance. However, during the Beethoven temperament project, I got a chance to listen to a variety of temperaments used for a variety of music, and it seems that on Mozart sounded better on a tuning such as the Kirnberger III than on the modified meantone. The meantone just was too plain lifeless. Maybe it would be better to approach it from the standpoint of "Anything but ET!" Regards, Ed Foote Precision Piano Works Nashville, Tn.