Gilbert and Sullivan and "Ruddigore", which were less successful than the seven other operas from "H.M.S. Pinafore" to "The Gondoliers", Sullivan asked to leave the partnership, saying that he found Gilbert's plots repetitive and that the operas were not artistically satisfying to him. While the two artists worked out their differences, Carte kept the Savoy open with revivals of their earlier works. On each occasion, after a few months' pause, Gilbert responded with a libretto that met Sullivan's objections, and the partnership was able to continue successfully. In April 1890, however, during the run of "The Gondoliers", Gilbert challenged Carte over the expenses
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