SquareZ
I saw the dance as a vision of ineffable power. A man could, with dignity and a towering majesty, dance. Not mince, cavort, do “fancy dancing” or “showoff” steps. No: Dance as Michelangelo’s visions dance and as the music of Bach dances.
--Jose Limon
Calling Ideas for June 17, 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.