Music questions in quizbowl focus largely on the Western concert music repertoire, or what is often referred to as "classical music". Opera questions which focus on plot clues and aria names are not considered music questions (although questions on composers of operas which do not focus on these elements are generally considered "music), nor are questions on ballet or jazz, though those feature prominently in the Other Arts category. Questions on pop, rock music, metal, etc. are never acceptable topics for fine arts questions, and are always written as trash.
Because of the extremes difference in depth and type of knowledge between people with music theory education and knowledge of the concert repertory and those who do not, music is often considered one of the most difficult categories, if not the most difficult category in which to write good questions for a general quizbowl audience.
See Music mafia.