Question: James Stuart was a specialist in the roles of what type of moderate-to-very-fast music typically used in comic opera?
Sentence (from "James Stuart (opera director)"): He became a specialist in the patter roles of Gilbert and Sullivan, including Sir Joseph Porter, K.C.B. in "H.M.S. Pinafore", Ko-Ko in "The Mikado", and Reginald Bunthorne in "Patience" among others.
Relevant evidence: Yes