I have just enough theory to know what y'all are talking about, but let's back up a step here. The OP was asking about "Tuttle's Reel."
This is an Irish traditional tune.
For anyone deeply invested in Western music theory, Irish traditional music is not just a little weird, but it's
deeply weird. It's not based on classical Western Music Theory, although it shares some of the history of European development from Gregorian Chants as well as a bunch of foreign influences.
More than any other music I've played, this genre is the one that likes to fool around with shifting key/mode centers, and sometimes it's hard to find a key center at all! Common session tunes like "Kid on the Mountain" aren't
in a key, they shift tonal centers throughout the tune (E dorian to G in this case), and you'd better keep up with the flow. That's why some guitar players backing this kind of music favor tunings like DADGAD, which takes some of the effort out of figuring out the backing chords, because the open tuning has no third!
(...)
And if you make too strong a major chord statement on the guitar, it drives the fiddle players nuts, because you're messing with their ambiguous tonal centers.
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