Dance then wherever you may be,
I am the Lord of the Dance, said he,
And Iíll lead you all, wherever you may be
And Iíll lead you all in the dance, said he.
--Sydney Carter
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.