barn dance vs get one's freak on

barn dance

verb

To take part in barn dancing.

noun

A type of set step routine dancing, such as square dance.

get one's freak on

verb

To dance.
To have sex.
To go crazy; to freak out.
To party.

How often have the words barn dance and get one's freak on occurred in a corpus of books? (source: Google Ngram Viewer )