 Gilbert's music was known to millions.He composed many instrumental theme songs heard on American television through the 1950s and 1960s, including "The Rifleman", "Michael Shayne", "The Lawless Years", "", "Stories of the Century", The "Dick Powell Show", "Four Star Playhouse", The "DuPont Show with June Allyson", "The Detectives Starring Robert Taylor", "The Westerner", "Mrs. G. Goes to College", "Law of the Plainsman", "", "Man with a Camera", and "Burke's Law".Many of these were TV series produced by "Four Star Television" when Gilbert was Music Director.