In a general view of the history of the Opera, the central figures would be Gluck and Mozart. Before Gluck's time the operatic art was in its infancy, and since the death of Mozart, no operas have been produced equal to that composer's masterpieces. Mozart must have commenced his _Idomeneo_, the first of his celebrated works, the very year that Gluck retired to Vienna, after giving to the Parisians his _Iphigénie en Tauride_; but, though contemporaries in the strict sense of the word, Gluck and Mozart can scarcely be looked upon as belonging to the same musical epoch. The compositions of the former, however immortal, have at least an antique cast. Those of the latter have quite a modern air; and it must appear to the audiences of the present day that far more than twenty-three years separate _Orfeo_ from _Don Giovanni_, though that is the precise interval which elapsed between the production of the opera by which Gluck, and of the one by which Mozart, is best known in this country. Gluck, after a century and a half of opera, so far surpassed all his predecessors that no work by a composer anterior to him is ever performed. Lulli wrote an _Armide_, which was followed by Rameau's _Armide_, which was followed by Gluck's _Armide_; and Monteverde wrote an _Orfeo_ a hundred and fifty years before Gluck produced the _Orfeo_ which was played only the other night at the Royal Italian Opera. The _Orfeo_, then, of our existing operatic repertory takes us back through its subject to the earliest of regular Italian operas, and similarly Gluck, through his _Armide_ appears as the successor of Rameau, who was the successor of Lulli, who usually passes for the founder of the Opera in France, a country where it is particularly interesting to trace the progress of that entertainment, inasmuch as it can be observed at one establishment, which has existed continuously for two hundred years, and which, under the title of Académie Royale, Académie Nationale, and Académie Impériale (it has now gone by each of those names twice), has witnessed the production of more operatic masterpieces than any other theatre in any city in the world. To convince the reader of the truth of this latter assertion I need only remind him of the works produced at the Académie Royale by Gluck and Piccinni immediately before the Revolution; and of the _Masaniello_ of Auber, the _William Tell_ of Rossini, and the _Robert the Devil_ of Meyerbeer,--all written for the said Académie within sixteen years of the termination of the Napoleonic wars. Neither Naples, nor Milan, nor Prague, nor Vienna, nor Munich, nor Dresden, nor Berlin, has individually seen the birth of so many great operatic works by different masters, though, of course, if judged by the number of great composers to whom they have given birth, both Germany and Italy must be ranked infinitely higher than France. Indeed, if we compare France with our own country, we find, it is true, that an opera