1000 Cd's would be a first guesstimate. Why not contact a local professor who teaches statistics? Recording does need to be same hall same piano.>> Greetings, It may be a lesser sample, but I know there are a number of list members that have a copy of "Six Degrees Of Tonality". There is a trio of Mozart's "Fantasie" that offers a comparison of WT to ET on the same piano, same artist, same hall, same microphones, etc. Anybody that wants to offer a comparison can start right there, no? REgards, Ed Foote RPT
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