From a brief look this question arose: are these chord analogues a subset of real periodicity blocks in some special way? Your scale reminded me of the 4:5:6:7 double tied circular mirroring, but it's bigger and not a superset. Manuel ------------------------ Yahoo! Groups Sponsor ---------------------~--> Save on REALTOR Fees http://us.click.yahoo.com/Xw80LD/h1ZEAA/Ey.GAA/wHYolB/TM ---------------------------------------------------------------------~-> To unsubscribe from this group, send an email to: tuning-math-unsubscribe@xxxxxxxxxxxxxxx Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ ____________________________________________________________ To learn how to configure this list via e-mail (subscribe, unsubscribe, etc.), send a message to listar@xxxxxxxxxxxxx with the subject line "info tuning-math". Or visit the website: < //www.freelists.org/list/tuning-math > .