List of prominent operas

The operas listed cover all important genres, and include all operas regularly performed today, from seventeenth-century works by Monteverdi, Cavalli, and Purcell to late twentieth-century operas by Messiaen, Berio, Glass, Adams, Birtwistle, and Weir. The brief accompanying notes offer an explanation as to why each opera has been considered important. For an introduction to operatic history, see Opera. The organisation of the list is by year of first performance, or, if this was long after the composer's death, approximate date of composition.
This list provides a guide to the most important operas, as determined by their presence on a majority of selected compiled lists (dating from between 1984 and 2000) of significant operas: see the Lists consulted section for full details.
Significant firsts in opera history.
Operas not included in the above list, but which were important milestones in operatic history.
References.
Notes
Sources
Lists consulted.
This list was compiled by consulting nine lists of great operas, created by recognized authorities in the field of opera, and selecting all of the operas which appeared on at least five of these (i.e. all operas on a majority of the lists). The lists used were: