It sure is awesome to see some posts related to classical music! I was not sure how much response it would generate when I started the post. Cool!
Anyway, regarding the topic of Opera, I would have to very much agree with previous comment.... It is tough to only listen to it (one, I am such a visually oriented person) as a CD, tape, or on radio... & I admit it gets boring that way. Some folks would disagree with me there (such as people with stronger listening ability versus visual)... & that is ok. However, once I am in a concert hall or opera house (or see it on DVD), it becomes a whole new realm that I love experiencing. My favorites would include the so called "big guns" like Carmen, Tosca, Aida, and Turandot, and less well knowns such as Dvorak's Rusalka and Mussorgsky's Boris Gudonov. Somehow watching opera for me makes it transform from something to dull to a truly spectacular theatrical event.