The new documentary from filmmakers Chris Simon and Maureen Gosling profiles Arhoolie Records founder Chris Strachwitz, who for more than 50 years has been tracking down and making records of the humble grassroots music that most excites him. This could be just about anything — Delta blues, Cajun, Tex-Mex, Appalachian — as long as it's not the mainstream stuff Strachwitz refers to very pejoratively as "mouse music."