2-7 Syntonic Comma Meantone
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In 2/7-comma meantone, the JI fifth of 3/2 is flattened by 2/7 of a syntonic comma (81/80.) It is one of the meantone tunings proposed early on, by Gioseffo Zarlino, Francisco Salinas and Vincenzo Galilei. It may also be described as the regular tuning which tempers out 81/80 and tunes 2 and 25/24 purely.