 Siegel also wrote song parodies, including several of those in the "Mad" special issue which ultimately provoked a failed lawsuit by Irving Berlin and other composers which established certain copyright law protections that endure to this day.In 1965, at the behest of composer Mary Rodgers and "Mad" publisher William Gaines, Siegel collaborated with Stan Hart on "The Mad Show".The world-wide success of "The Mad Show" brought the Siegel and Hart families to Los Angeles in 1968.