Key signatures for Dorian, Mixolydian and minor modes in the most common trad Irish fiddle keys

This chart is from the Small Circle Tune Learning Session's old website. The SCTLS, a slow jam that formerly met in Colorado, had some excellent material on trad Irish music -- almost every bit of which also applied to old-time American string bands -- but they stopped meeting and their website went dark several years ago.

I have copied parts of it in the past to Hogfiddle (links below) for non-profit educational purposes. Here is their explanation of the modes most often encountered in trad Irish music:

Jason Amini's chart follows. I can't make heads or tails of it, but I don't understand the Circle of Fifths. If I did, I suspect I'd feel differently. So here it is, for those who relate to that kind of thing:

Other excerpts from the Small Circle Tune Learning Session on Hogfiddle. They overlap, but the context for each is a little different:

• http://hogfiddle.blogspot.com/2013/03/prairieland-strings-be-thou-my-vision.html -- learning tunes by ear.
• http://hogfiddle.blogspot.com/2013/05/prairieland-strings-getting-ready-for.html -- learning tunes "on the fly" at full speed.
• http://hogfiddle.blogspot.com/2013/02/first-clayville-pioneer-academy-of.html -- goals of a "tune learning session," both SCTLS and Clayville.

• http://hogfiddle.blogspot.com/2012/09/stephen-sieferts-join-jam-workshop.html -- more block quotes on the purpose and philosophy of a slow jam/tune learning session.

• http://slowplayers.org/ -- much, much more, including resources copied from SCTLS before its website went dark, BASS (the Bay Area Slow Session) and others at this "on-line tutor for learning to play the traditional music of Ireland, Scotland, Wales, Galicia, England, and beyond."

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Also parked here, so I won't lose the link and the cite:

Ron Powers, Mark Twain, on Google Books -- Old Woman of Our Town