Had the good folks at Lone Star Productions only decided not to dub John Wayne's voice with some forgettable cowboy ballads this would have been a far better western than it turned out to be.
Of course Wayne in later years would cringe at the mention of these films. If you want a good idea of how he really sounded listen to him in McLintock singing a favorite ballad of his, The Moon Shines Tonight on Pretty Redwing. The Lone Star people might have even looked for a young band singer working day to day in clubs in New Jersey around this time named Frank Sinatra who over 30 years later actually had his voice come out of Wayne's mouth during a Dean Martin show.
If they could have cut out the singing gimmick, Riders of Destiny is not a bad film, in fact a cut above some of the westerns the Duke was doing at the time. Ranchers in the valley are being squeezed out by a greedy villain played by Forrest Taylor. He's built a dam and controls all the water and it's either sell to him outright or pay his exorbitant prices for water. Gabby Hayes and his daughter Cecelia Parker happen to have the only other water around because they dug a well. Taylor especially wants their land.
The citizens have written to the federal government in Washington for intervention and they get it in the form of John Wayne. I don't think I have to go any farther. The Duke finds a very clever solution for the water problem which you should see the film to find out.
But don't lose your lunch hearing that Nelson Eddy wannabe voice coming out of Mr. Wayne's mouth.