The Singing Cowboy (1936)

When Gene's boss is murdered, the boss's daughter is seriously injured. To raise money for her operation, Gene and the ranch hands enter the new medium of television as singers. When they do well, the bank agrees to lend them the needed money. Martin, who is the murderer, is after the ranch. Now he has to make sure the daughter doesn't get the operation so he sends his henchmen out to wreck Gene's equipment.