Gilbert and Sullivan change the characters, which Sullivan found artificial and lacking in "human interest and probability", as well as being too similar to their earlier opera, "The Sorcerer". As dramatised in the film "Topsy-Turvy", the author and composer were at an impasse until 8 May 1884, when Gilbert dropped the lozenge idea and agreed to provide a libretto without any supernatural elements. The story focuses on a "cheap tailor," Ko-Ko, who is promoted to the position of Lord High Executioner of the town of Titipu. Ko-Ko loves his ward, Yum-Yum, but she loves a musician, who is really the son of the
Gilbert and Sullivan many of which were familiar from European opera (and some of which grew out of Gilbert's earlier association with the German Reeds): the heroic protagonist (tenor) and his love-interest (soprano); the older woman with a secret or a sharp tongue (contralto); the baffled lyric baritone—the girl's father; and a classic villain (bass-baritone). Gilbert and Sullivan added the element of the comic patter-singing character. With the success of "H.M.S. Pinafore", the D'Oyly Carte repertory and production system was cemented, and each opera would make use of these stock character types. Before "The Sorcerer", Gilbert had constructed his plays around the established