What do you know about "The Washboard Band"?

Some years ago an individual left this photo at the museum with the words "I know the group was called 'The Washboard Band' but that's all I know. I don't know their names or when or where they played".

This photo remains a mystery. They are an interesting looking group. We rather like the man (maybe lady) who plays the washtub.

Might you be able to provide even a small clue? If yes, please contact the Historical Society at info@tavistockhistory.ca. Thank you.