The Overture To William Tell is a 1947 short starring Wally Walrus.
In this Lantz Color Cartune (production number 2326), Wally Walrus, masquerading as famed orchestra leader, Sir Wally Walrus, mounts the podium to conduct the orchestra, and his troubles only end when the cartoon does, with the orchestra completely destroyed.
No concert season would be complete without the well-known "Overture to William Tell" as conducted by Sir Wally Walrus. The performance is noteworthy for its novel detours from accepted musical techniques. The tendency of the orchestra to fall asleep is overcome by the special-effects man, who puts on a storm that goes beyond description. The music goes on in spite of high water, the chief casualty of which is Wally's vest. It shrinks to nothing and explodes, blowing off his shirt and coat. A horsefly takes on the villain's role from here on, successfully managing the complete destruction of the orchestra, all in the praiseworthy cause of good music.