Public Domain Movies and Audio: Take Me Back To Oklahoma (feat. Bob Wills), 1940

Info from archive.org:
Director: Albert Herman
Producer: Edward Finney
Production Company: Monogram Pictures Corporation
Audio/Visual: sound, b&w
Creative Commons license: Public Domain

Info from IMDB:
Wanted by the law...marked by the lawless...betrayed by his best friend...but you can't stop a Texan while there's a song on his lips...and lead slugs in his six guns!

TEX DRIVES THE MAIL STAGE...THROUGH WILD KILLER COUNTRY! (original ad - all caps)

Typical Monogram B-Western starring Tex Ritter, most notable for performances by BOB WILLS & HIS TEXAS PLAYBOYS.

Nowadays distributed by several companies specialising on Public Domain video and also downloadable in various formats at archive.org, this is the best quality incarnation I have come across (CONSIDERABLY BETTER THAN THE STREAMING VIDEO EMBEDDED), suffering from less cuts and skips than the aforementioned archive.org copy and considerably better than the copy the following YouTube clip was taken from (as a comparison between the clip and the provided screenshots will amply demonstrate):

DOWNLOAD (Divx as multi-part rar-file, each part around 100 MB):