First, "Arizona Days" stars Tex Ritter as a heroic cowpoke who joins a travelling medicine show with his sidekick and spends his time warbling tunes, romancing a beauty and stopping a villain's dastardly plot. Syd Saylor, William Faversham, Eleanor Stewart co-star. Then, in "Sing, Cowboy, Sing," Ritter is joined by Mack Sennett resident loonies Al St. John and Snub Pollard as he tries to stop some wagon robbers. With Louise Stanley, Charles King. Standard; Soundtrack: English. Plays All Regions.