| Title | Edition | Year of Publication | Contributors | Country of Publication | Possible Copyright Status | Available Online? |
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| Acting in opera | | 1915 | George Edward Shea | |  |  | | |    
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| American opera and its composers | | 1927 | Edward Ellsworth Hipsher | | | | | |
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| American opera and its composers | | 1934 | Edward Ellsworth Hipsher | | | | | |
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| The American singer | | 1937 | Oscar Thompson | | | | | |
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| Backstage at the opera | | 1937 | Aimé Gerber, Rose Heylbut | | | | | |
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| Behind the scenes at the opera | | 1925 | Mary Fitch Watkins, Mary Fitch (Watkins) Cushing | | | | | |
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| Über die Möglichkeiten der Oper und über die Partitur des "Doktor Faust" | | 1926 | Ferruccio Busoni |  |  | | | |
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| Building the amateur opera company: a guide for prospective organizers of amateur opera companies, offering helpful suggestions as to selection of efficient officers and directors, together with practical advice as to development and capable functioning of the chorus, ballet and orchestra | | 1930 | Roy B. Kester, Ralph Herman Korn, S. Bernard Koopman | | | | | |
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| The complete opera book: the stories of the operas, together with 400 of the leading airs and motives in musical notation | | 1919 | Gustav Kobbé, Katharine Wright | | | | | |
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| The complete opera book: the stories of the operas | | 1935 | Gustav Kobbé, Katharine Wright, Ethel R. (Ethel Rose) Peyser | | | | | |
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| Das colk und seine bühne | | 1937 | Rainer Schlösser | | | | | |
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| Die deutsche spieloper | | 1924 | Kurt. Lüthge | | | | | |
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| Die operette in ihrer geschichtlichen entwicklung; musik/libretto/darstellung. Mit 54 tafeln | | 1926 | Otto Keller | | | | | |
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| Early Italian & French opera: opera in its lighter forms, opera houses & mise-en-scène | | 1927 | Fullerton Leonard Waldo | | | | | |
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| Early opera in America | | 1915 | O. G. (Oscar George) Sonneck | | | | | |
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| English stories of Russian grand operas | | 1922 | Tschaikowsky, Dargomijsky, Rimsky-Korsakow | | | | | |
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| The European vogue of Favart: the diffusion of the opéra-comique | | 1932 | Alfred Iacuzzi | | | | | |
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| Favart's unpublished plays: the rise of the popular comic opera | | 1935 | Paul John Salvatore | | | | | |
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| Fifty favourite operas: a popular account intended as an aid to dramatic and musical appreciation | | 1925 | Paul. England | | | | | |
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| French operatic readings: the French originals of five great operas | | 1938 | Gerald Thomas Wilkinson | | | | | |
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| A front seat at the opera | | 1948 | George Richard Marek | | | | | |
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| German and Russian opera | | 1927 | Fullerton Leonard Waldo | | | | | |
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| The grand opera singers of to-day | New rev. ed. | 1922 | Henry Charles Lahee | | | | | |
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| The grand opera singers of to-day: an account of the leading operatic stars who have sung during recent years, together with a sketch of the chief operatic enterprises | | 1912 | Henry Charles Lahee | | | | | |
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| Guide to the opera: an elucidation of the librettos for quick reference | | 1912 | William Krauss | | | | | |
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| Handbook of the operas | | 1915 | Edith B. (Edith Bertha) Ordway | | | | | |
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| A history of opera: giving an account of the rise and progress of the different schools, with a description of the master works in each | | 1926 | Arthur Elson | | | | | |
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| How to present the Gilbert and Sullivan operas | | 1934 | Albert Oliver Bassuk | | | | | |
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| I profeti di Babilonia | | 1924 | Gian Francesco Malipiero |  | | | | |
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| Il teatro alla moda | | 1927 | Andrea d' Angeli, Benedetto Marcello | | | | | |
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| The International library of music for home and studio: music literature | | 1925 | | | | | | |
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| The International library of music for home and studio | | 1925 | Charles Frederick Dennée, Nicholas De Vore | | | | | |
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| L'Opéra (1669-1925) | | 1925 | J.-G. (Jacques-Gabriel) Prod'homme |  | | | | |
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| Les chefs-d'œuvre du répertoire: opéra, opéra-comique, opérette | | 1914 | Édouard Combe | | | | | |
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| Life with the Met | | 1954 | Helen Klaffky Noble | | | | | |
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| The lure of music, depicting the human side of great composers | | 1918 | Olin Downes | | | | | |
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| The lure of music: picturing the human side of great composers, with stories of their inspired creations | | 1922 | Olin Downes | | | | | |
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| Master builders of opera | | 1933 | George Clarence Jell, Frank E. Southard | | | | | |
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| Meine Lehrjahre bei Bruckner: Erinnerungen und Betrachtungen | | 1927 | Friedrich Klose | | | | | |
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| The Metropolitan opera, 1883-1935 | | 1936 | Irving Kolodin | | | | | |
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| The Metropolitan opera, 1883-1939 | | 1940 | Irving Kolodin | | | | | |
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| The Metropolitan opera: a statement | | 1925 | Otto Hermann Kahn | | | | | |
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| The Metropolitan Opera murders | | 1951 | Helen Traubel | | | | | |
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| Meyers opernbuch: einführung in die wort- und tonkunst unserer spielplanopern | | 1935 | Otto Schumann | | | | | |
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| Minute stories of the opera | | 1932 | Paul Nordoff, Paul Grabbe | | | | | |
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| Modern French and Italian opera | | 1927 | Fullerton Leonard Waldo | | | | | |
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| Murder in the opera house | | 1934 | Queena Mario | | | | | |
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| Musico-dramatic producing: a manual for the stage and musical director | | 1930 | Charles T. H. Jones, Donald Wilson, Clark Fiers | | | | | |
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| Mysteries of the great operas: Faust, Parsifal, the ring of the Niebelung, Tannhauser, Lohengrin | 1st ed. | 1921 | Max Heindel | | | | | |
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| Opera and its enjoyment | | 1960 | Thomas Henry Briggs | | | | | |
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| Opera and its stars: a description of the music and stories of the enduring operas, and a series of interviews with the world's famous sopranos | | 1924 | Mabel Wagnalls | | | | | |
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| The opera book | Rev. and enl. | 1917 | Edith B. (Edith Bertha) Ordway | | | | | |
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| The opera book | | 1915 | Edith B. (Edith Bertha) Ordway | | | | | |
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| Opera caravan: adventures of the Metropolitan on tour, 1883-1956 | | 1957 | Quaintance Eaton | | | | | |
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| The opera goers' complete guide: comprising two hundred and twenty-nine opera plots with musical numbers and casts | | 1911 | Leo Melitz, Richard Salinger | | | | | |
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| The opera murders | | 1933 | Kirby Williams | | | | | |
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| Opera stories: in a few words, the stories (divided into acts) of about 300 operas and ballets | | 1920 | Henry Lowell Mason | | | | | |
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| Opera stories: in few words, the stories (divided into acts) of 164 operas, 6 ballets and one mystery play | 5th ed. | 1912 | Henry Lowell Mason | | | | | |
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| Opera stories: in few words, the stories (divided into acts) of 169 operas | | 1911 | Henry Lowell Mason | | | | | |
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| Opera synopses: a guide to the plots and characters of the standard operas | 3d ed., rev. and enl. | 1921 | J. Walker McSpadden | | | | | |
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| Opera synopses: a guide to the plots and characters of the standard operas | | 1927 | J. Walker McSpadden | | | | | |
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| Opera synopses: a guide to the plots and characters of the standard operas | Rev. and enl. | 1915 | J. Walker McSpadden | | | | | |
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| Opera synopses: a guide to the plots and characters of the standard operas | | 1911 | J. Walker McSpadden | | | | | |
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| Operas that every child should know: descriptions of the text and music of some of the most famous masterpieces | | 1911 | Mary Schell Hoke Bacon, Mary Schell (Hoke) Bacon | | | | | |
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| The operatic problem | | 1902 | William Johnson Galloway | | | | | |
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| Opernführer: oper, operette, ballett, schauspielmusik. Mit 17 kunstdruck-tafeln | | 1935 | Wolfgang Retslag, Johannes Scholtze | | | | | |
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| Opernführer | | 1935 | Ferdinand von Strantz, Walter Abendroth | | | | | |
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| The phantom of the opera | | 1911 | Andre Castaigne, Gaston Leroux | | | |  | |
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| Philidor et l'évolution de la musique française au XVIIIe siècle | | 1921 | George Edgar Bonnet |  | | | | |
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| Preparation and presentation of the operetta | | 1930 | Frank A. (Frank Ambrose) Beach | | | | | |
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| Prima donna: a novel of the opera | | 1929 | Pitts Sanborn | | | | | |
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| Prima donnas and other wild beasts | | 1961 | Alan. Wagner | | | | | |
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| The prize song: stories of famous operas | | 1935 | Henriette Weber | | | | | |
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| Reclams Opernführer | | 1928 | Georg Richard Kruse | | | | | |
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| A second book of operas: their histories, their plots, and their music | | 1917 | Henry Edward Krehbiel | | | | | |
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| Signora | | 1907 | Gustav Kobbé | | | | | |
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| The song of the lark | | 1915 | Willa Cather | | | | | |
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| The standard operaglass: detailed plots of the celebrated operas, with critical and biographical remarks and dates | | 1927 | Charles Annesley | | | | | |
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| The standard operaglass: detailed plots of the celebrated operas, with critical and biographical remarks and dates | Rev. ed. | 1934 | Charles Annesley | | | | | |
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| The standard operaglass: detailed plots of two hundred and thirty-five celebrated operas, with critical and biographical remarks, dates, etc | New ed., rev. and brought up to date. | 1920 | Charles Annesley | | | | | |
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| The standard operas, their plots and their music | | 1928 | George P. (George Putnam) Upton | | | | | |
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| The standard operas: their plots and their music | New ed., enl. and rev. Profusely illustrated. | 1912 | George P. (George Putnam) Upton | | | | | |
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| Storia del dramma musicale | | 1924 | Edouard Schuré | | | | | |
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| Stories of the great operas | | 1928 | Ernest Newman | | | | | |
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| Stories of the operas | | 1913 | Ethel Shubert | | | | | |
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| The story of a hundred operas | | 1915 | Felix Mendelsohn | | | | | |
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| The story of the Metropolitan Opera, 1883-1950: a candid history | [1st ed.] | 1953 | Irving Kolodin | | | | | |
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| Ten years of American opera design at the Juilliard School of Music: a list of the material presented to the New York Public Library by the Juilliard School of Music and displayed, in part, in an exhibition held in the library from November l3 to December 10, 1941 | | 1941 | | | | | | |
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| Thirty years' musical recollections | | 1926 | Ernest Newman, Henry Fothergill Chorley | | |  | | |
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| A thousand and one nights of opera | | 1926 | Frederick Herman Martens | | | | | |
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| Verdi: a novel of the opera | | 1925 | Franz Werfel, Helen Jessiman | | | | | |
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| The Victor book of the opera: stories of seventy grand operas with three hundred illustrations & descriptions of seven hundred Victor opera records | | 1912 | Samuel Holland Rous | | | | | |
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| The Victor book of the opera: stories of the operas, with illustrations and descriptions of Victor opera records | | 1936 | Samuel Holland Rous, Charles O'Connell | | | | | |
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| The Victrola book of the opera: stories of the operas with illustrations and descriptions of Victor opera records | | 1919 | Samuel Holland Eons, Samuel Holland Rous | | | | | |
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| The Victrola book of the opera: stories of the operas, with illustrations & descriptions of Victor opera records | | 1921 | Samuel Holland Rous | | | | | |
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| The Victrola book of the opera: stories of the operas | | 1929 | Samuel Holland Rous | | | | | |
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| Évolution de la musique de théâtre depuis Meyerbeer jusqu'à nos jours | | 1927 | Arthur Dandelot | | | | | |
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| The Wagnerian romances | | 1925 | Willa Gather, Gertrude Hall, Gertrude Hall Brownell | | | | | |
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| The Wagnerian romances | | 1907 | Gertrude Hall Brownell | | | | | |
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| Wandlungen der Oper | | 1934 | Paul Bekker |  | | | | |
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| The world of opera | | 1956 | Robert Lawrence | | | | | |
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| The Young Prima Donna: A Romance of the Opera | | 1840 | Mrs. (Elizabeth Caroline) Grey | | | | | |
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Public Domain Books