Shrimp Crawl (2013)

Trailer
An English musicologist discovers an audio tape of ancient, mesmerizing music,called Shrimpcrawl, that leads him south, to the salt marshes of Florida. He finds a remote group that has kept alive the intoxicating 'music of the grass'. A charismatic leader uses the music and other means to control his followers. Big trouble ensues when the Englishman attempts to tape music. A young ad agency intern from New York is also headed for the marshes, for a fishing trip with his estranged father, an oyster fisherman. They cross paths with the researcher, and questions arise about the father's relationship to the clan and it's leader. A startling revelation leads to a showdown between those seeking power over others and those discovering power to change themselves.