I posted this in the other "7th" thread, but the story makes me smile, so I kinda wanted folks to read it.
And what about all those jazzy augmenteds and 7ths Doc Watson uses?
THOUGH ... 30 years ago Paul Simon and George Harrison dueted on "Homeward Bound." It was on the old Smothers Brothers Comedy Hour.
George, who I think was playing that big J-200 he liked, stuck a maj. 7th into the second "homeward bound ..." during the chorus.
Obviously he was just trying to improv a little and vary things somewhat from the (nearly perfect) original. "Getting a bit of his own in," as you Brits might say.
But it was such a turkey from the hands of such a normally fine player that those of us ancient enough to recall the show still smile at the memory.
God bless you George. Wherever your heaven is, I know you're there. If misplaced 7ths were a cardinal sin, we'd all be in hell.
Best wishes, Tony