SquareZ
One great advantage of the dance is the aid it gives in correcting defects of deportment. It is a most effective cure for shyness and self-distrust in public. It is a valuable antidote to awkwardness and hesitancy. It develops self-possession and an easy, competent carriage. And it accomplishes these benefits without expense to natural modesty, for modesty of deportment is one of the prime requirements of the ball room.
--Henry Ford
Calling Ideas for June 18, 2012

June is:

National Accordian Awareness Month
National Accordion Awareness Month was established in 1989 to promote the accordion, help spread the word about the resurgence in popularity in the accordion and to educate people about the accordion. Here's some info.

I'm sure there are bunches of (old) square dance records that feature the accordian. I tend to associate MacGregor with accordian arrangements.