This collection examines the phenomenon of the operatic canon: its formation, history, current ontology and practical influence, and future. It does so by taking an international and interdisciplinary view: the workshops from which it was derived included the participation of critics, producers, artistic directors, stage directors, opera company CEOs, and even economists, from the United Kingdom, the United States, France, Italy, Ireland, Germany, the Netherlands, Denmark, and Canada. The volume is structured as a series of dialogues: each subtopic is addressed by two essays, introduced jointly by the authors, and followed by a jointly compiled list of further reading. These paired essays complement each other in different ways, for example by treating the same geographical location in different periods, by providing different national or regional perspectives on the same period, or by thinking through similar conceptual issues in contrasting milieus. Part I consists of a selection of surveys of operatic production and consumption contexts in France, Italy, Germany, England, Russia, and the Americas, arranged in rough order from the late seventeenth century to the late nineteenth century. Part II is a (necessarily) limited sample of subjects that illuminate the operatic canon from different—sometimes intentionally oblique—angles, ranging from the influence of singers to the contiguous genres of operetta and musical theater, and the effects of recording and broadcast over almost 150 years. The volume concludes with two essays written by prominent figures from the opera industry who give their sense of the operatic canon’s evolution and prospects.