From January 1941: Leave it to Hollywood to think up ways and means of having fun at parties. The newest is the musical instrument gag that develops into an amateur orchestra with big name guests furnishing the music, if such it can be called. Going on the assumption that everyone thinks he can play some instrument whether he can or not, the Jack Bennys, at a recent shindig, rented an assortment of musical noisemaners and bade the guests go to it. Clark Gable and Bob Taylor each grabbed a saxophone, Gracie Allen a flute, Barbara Stanwyck a trombone, Jack Benny a bass violin, while Mary Livingston snitched the drums. After…