Rhythm of the Saddle

Rhythm of the Saddle is a 1938 American Western film directed by George Sherman and starring Gene Autry, Smiley Burnette, and Pert Kelton. Written by Paul Franklin, the film is about the foreman at a ranch owned by a wealthy rodeo owner who will lose her rodeo contract unless sales improve.

Following a series of accidents apparently caused by negligence during the rodeo, Maureens foreman, Gene Autry Gene Autry, sets out to prove that Pomeroy is responsible. Maureens Aunt Hattie Pert Kelton wins some money at a roulette table at Pomeroys club, thanks to Genes disabling of the rigged mechanisms. Returning home, they are ambushed by Pomeroys men. Later, Gene breaks into Pomeroys office to get additional proof of his guilt.On the last day of the Frontier Week rodeo, Gene rides against one of Pomeroys men in the final event, a stagecoach race. Aunt Hattie bets everything she has on Gene, hoping to save the ranch. When Gene discovers his friend, Frog Milhouse Smiley Burnette, making a recording of a proposal to Hattie, he realizes that Frogs recorder could entrap Pomeroy. He instructs Frog to place the device below Pomeroys seats at the rodeo just before the start of the race. ........

Source: Wikipedia