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Contra dance

From Wikipedia

Thursday night contras in Cambridge, Massachusetts.
Thursday night contras in Cambridge, Massachusetts.

Contra dance (also Contradance, Contra-dance and other variant spellings) refers to several folk dance styles in which couples dance in two facing lines. The name may derive from the name of a French dance very popular in the 18th century. Some authorities (including the Oxford English Dictionary) state that the name's origin is a corruption of the English country-dance, while others (including Merriam-Webster) contradict this. Whatever the origins of the term, this article is about an American folk dance style, contra dance, the dances, called contra dances that comprise that style, and the regularly-scheduled evening events, also called contra dances, where people get together to participate in the folk tradition.

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