 As musical director, Norris was responsible for a number of changes to Sullivan's scores.Prominent horn parts were added to the accompaniment to "A Lady Fair" in "Princess Ida" that are customarily referred to as the "Norris" horn parts, though they may have been written by Toye.They were expunged by Sargent but subsequently restored by the D'Oyly Carte musical director Royston Nash in the 1970s.