And I thought I knew theory.......LOL!!

Some things I have pulled out of this:
1)Melody rules chord changes
2)Key change does not always mean "key" change
it can mean to a "relative".....(see Circle of 5ths)
3)Modulate may not mean modulate

As a fiddler, I usually only use I,IV and VII to chop with...lazy, I guess.

Remember, too, that keys are related (Circle of 5ths)
Isn't a G chord a "double inverted" C chord? or something like that?
When you play Irish music, just throw in a relative minor somewhere; it will always be OK......(grin)

Wish we could tie this in with the "What is a Key" thread......I think I'm glad I'm not a guitar player....all those strings, all those chords.('nother grin)