In Old Arizona is a 1928 Western. Wikipedia cites it as "the first major Western to use the new technology of sound and the first talkie to be filmed outdoors" and says, "The film made extensive use of authentic locations". It also credits the film with being "instrumental in developing the image of the singing cowboy" for which I am not grateful. I was never a fan of the singing cowboy.
The scene where the Cisco Kid and the soldier size each other up -"you got nice big gun, too, eh" while patting each other's holstered guns- was interesting. That came early, and it affected the way I watched the rest of the movie.
Goat Dog describes how bad it is in some detail. I didn't think it was that bad, but the "singing cowboy" is unforgivable.