Opus 1 Classical searches for classical music concerts and operas in New York, London, Paris, Berlin, Vienna, Sydney, and other major cities around the world. Use the “concert finder” box on the right to search for upcoming concerts by city and/or date.

AllAboutOpera.com , cited in the first section for its news resources, also provides season schedules for all the major U.S opera companies. Select a company and then choose to read a “Summary” of the season, the “Next 30 Days,” or the “Next 60 Days.” The latter two choices list actual performance dates, as well as links about the opera’s history and its composer.

PlaybillArts , noted earlier as a worthy opera news source, posts worldwide opera listings. Choose a time frame between today’s date and three weeks from now, as well as a location, and get all the essential information about a performance, including who’s in it, how to buy tickets, and how to get to the venue.

OperaGlass , a useful research tool offered by Stanford University, has a worldwide list of opera companies. It includes many more companies than the AllAboutOpera.com company season list, and it links to particular companies for more season information. View the list geographically (by continent and country) or alphabetically (by company or theater name).

The Seattle Community Network provides links to opera companies in the Northwest including companies located in Washington State, Oregon, and British Columbia. The site’s attention to smaller companies in those areas makes it stand out; however, as you scroll down the page, you’ll find that the list inches its way southeast until it’s covered pretty much the whole country. There are some international companies listed as well.

Coast To Coast Tickets is a small, easy-to-navigate online ticket sales company that offers alphabetized lists of operas and venues in Europe and America. Find your show, select your seats and performance, and then follow directions to purchase the tickets using the site’s secure connection.

StubHub is a branch of eBay devoted entirely to the reselling of tickets to concerts, plays, and sporting events. On the “Classical Music and Opera” page you’ll find listings of all available performances. Use the search tool on the upper left of the page to find a specific production.