 In addition to the main theme songs, Gilbert also composed library music cues used in many TV series episodes, including episodes of "Gunsmoke", "The Big Valley", "The Adventures of Superman", "Leave It to Beaver", "Johnny Ringo", "Harrigan and Son", "McKeever and the Colonel", "Gilligan's Island" and "Perry Mason".During his library music years, he formed a publishing company named for his sons "John Paul Music" to collect ASCAP publisher royalties.His film work includes "It's a Wonderful Life" (1947), "The Jackie Robinson Story" (1950), "The Thief" (1952), "Carmen Jones" (1954), "It Came from Beneath the Sea" (1954), "Beyond a Reasonable Doubt" (1956), "No Place to Hide" (1956), "Comanche" (1956), "Slaughter On Tenth Avenue" (1957), "Sam Whiskey" (1969), "I Dismember Mama" (1974), and "The Witch Who Came from the Sea" (1976).