Range Beyond the Blue (1947)

Singing cowboy Eddie Dean and his sidekick Soapy (Roscoe Ates) enter into the thick of things when they thwart a stagecoach holdup. Our heroes take it upon themselves to champion the cause of stage-line owner Margie Rodgers (Helen Mowery), who's being victimized by an unknown villain. Dean suspects that there's more to the case than mere robbery, and he's right: someone wants to gain control of Margie's business, and that someone is?