Which of these world-famous opera houses is the oddest one out?

Which are the correct statistics for Wagner's cycle?

Which term among these is the odd one out?

The operatic tradition had already begun where, and by when?

Another 'odd one out' selection ... odder than some, we might fairly say!

The first 150-odd years of opera were dominated, largely, by increasing Baroque sophistication in their music and staging (within what was then technically possible) and it is now around 250 years since a drive began to make the inherently complex medium stylistically leaner, more elegant without a lot of padding and swagger. The opera (with its famous ballet usually known as ) was the work of which composer?

Who was the French composer that updated the Orpheus legend in 1858 (the same year as Moreschi was born), but in a far more buffoon-and-burlesque manner, including the famous 'Infernal Galop' known to most people as the Can-Can?

Another 'odd-one-out' ... or in this case, 'odd more-or-less-than-one' out, since three of these composers only completed one opera each. Who finished MORE or FEWER than one?

is also known in French and Italian, but its music is by a 20th-century Russian composer: who?

Which of these is the correct trio for the Three Tenors?