The lovers of opera have something to look forward to in Boston; what, we shall see when we survey the field elsewhere. Our noble Boston theatre must needs be one point in the triangular campaign of the three cities. And here we may allude, _en passant_, to the prospect of one novelty that ought to interest our opera-lovers who are weary of the usual hackneyed _répertoire_. Our townsman, Mr. L. H. Southard, the composer of "The Scarlet Letter," has also written an Italian opera, on an Oriental subject, with the title "Omano," the libretto by Signor Manetta, founded on Beckford's "Vathek." A private or subscription concert will soon give an opportunity of hearing some of its scenas, quatuors, etc. To come back, then, to what is more peculiarly Bostonian in the way of music,--what concerts shall we have? Of large societies, the only one remaining now in operative force is the oldest and the largest, the Handel and Haydn Society. This set the right example last May, in that splendid three-days' Festival, of true domestic musical enterprise, organizing the whole thing on the basis of internal and domestic means, with our own permanent nucleus of orchestra and chorus, and drawing from without such other talent, such solo singers, as were needed for the right interpretation of the noble music, and not merely for their own private exhibition and profit. This was genuine; this was wholesome; and the success warrants the best hopes for another season. Carl Zerrahn, the excellent conductor upon that occasion, is on his way home from Germany (his _old_ home) with new stock of zeal and of new music, and the oratorio rehearsals will at once begin. It is event enough for one winter, the single fact that Handel's "Israel in Egypt," that mightiest oratorio, which is one mountain range of sublime choruses, will be the chief subject of study. It is proposed to give at least four Sunday-evening performances, consisting of "The Messiah," of course, at Christmas; Costa's "Eli," or "Elijah"; the "Requiem" of Mozart, and the "Lobgesang" by Mendelssohn; and for the last, and we trust many last, "Israel in Egypt." All this will be but so much rehearsal for the grander Festival to follow. We have no organized orchestral or symphony society, as we should have; but we have with us always the elements of a good orchestra, who always work well together, and never better than last year under the enterprise and drill of Mr. Zerrahn. Then we had glorious symphonies and overtures, both old and new; and we shall have as good, and still more brilliant concerts soon, if hard times do not daunt the leader's very sanguine purpose. As a pendant, too, to the orchestral evenings, will come cheap afternoon concerts in the Music Hall, where good symphonies and overtures, with sparkling varieties for younger tastes, will hold out weekly invitation.