One of the best pieces in the final scene of "Fidelio" was taken from a cantata on the death of the emperor of Austria, composed by Beethoven before he left Bonn. The melody originally conceived for the last movement of the Symphony in D minor was developed into the finale of one of the last string quartets. In fact the instances in which composers have put their pieces to widely divergent purposes are innumerable and sometimes amusing, in view of the fantastic belief that they are guided by plenary inspiration. The overture which Rossini wrote for his "Barber of Seville" was lost soon after the first production of the opera. The composer did not take the trouble to write another, but appropriated one which had served its purpose in an earlier work. Persons ignorant of that fact, but with lively imaginations, as I have said in one of my books, ["A Book of Operas," p. 9] have rhapsodized on its appositeness, and professed to hear in it the whispered plottings of the lovers and the merry raillery of Rosina contrasted with the futile ragings of her grouty guardian; but when Rossini composed this piece of music its mission was to introduce an adventure of the Emperor Aurelianus in Palmyra in the third century of the Christian era. Having served that purpose it became the prelude to another opera which dealt with Queen Elizabeth of England, a monarch who reigned some twelve hundred years after Aurelianus. Again, before the melody now known as that of Almaviva's cavatina had burst into the efflorescence which now distinguishes it, it came as a chorus from the mouths of Cyrus and his Persians in ancient Babylon. When Mr. Lumley desired to produce Verdi's "Nabucodonosor" (called "Nabucco" for short) in London in 1846 he deferred to English tradition and brought out the opera as "Nino, Re d'Assyria." I confess that I cannot conceive how changing a king of Babylon to a king of Assyria could possibly have brought about a change one way or the other in the effectiveness of Verdi's Italian music, but Mr. Lumley professed to have found in the transformation reason for the English failure. At any rate, he commented, in his "Reminiscences of the Opera," "That the opera thus lost much of its original character, especially in the scene where the captive Israelites became very uninteresting Babylonians, and was thereby shorn of one element of success present on the Continent, is undeniable."