a routine b western in the lone star series of western wayne make in the 30 . what set this one apart be john wayne a a singing cowboy . this be the time of the beginning of the singing cowboy era in b western ( e. g. gene autry ) . wayne voice be obviously dub . he sure doesn not look comfortable serenade the heroine or warble a tune while rid across the prairie . fortunately for all concern ( especially the duke ) this experiment be quickly end . anyone who want to hear the duke real singing voice should watch the opening credit of cahill u. s. marshal .