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Franz Stieger’s Opernlexikon is one of the most frequently consulted of all opera catalogues. It also contains ballets, oratorios, and other stage works, all listed by title, composer, and librettist. Lists of serious operas, cross-indexing of titles, and identification of librettists are especially noteworthy. The concluding two volumes, titled Nachträge, contain corrections as well as additions. With over 60,000 titles of stage works, the Opernlexikon exceeds every other published opera catalogue in size. It provides the place and date of every work's premiere (when known), along with an identification of its genre and number of acts. The Opernlexikon is especially valuable for works written and performed before 1920. A short introduction by Franz Grasberger, librarian of the music division of the Österreichische Nationalbibliothek, highlights the catalogue’s value in light of previously unpublished information. Grasberger also provides biographical information, not available elsewhere, on Stieger (1843–1938).

The 20th century violin concertante is the only comprehensive repertoire compendium of compositions written in and around the twentieth century for violin in a solo role in combination with an ensemble or other instruments. Bröker's interpretation of the term "concertante" is very inclusive, embracing any composition that contains at least a solo violin part and an accompaniment by an orchestra or larger ensemble; works featuring the violin within a group of solo instruments; and works that carry the words concerto, concertante, or their derivatives in their titles and feature prominent solo violin parts. The catalogue therefore includes tone poems, concert works, and even short miniatures of less than two minutes. The catalogue lists 13,000 compositions by more than 7000 composers, with additional information on the works. Names of Arab, Armenian, Georgian, Greek, and Persian composers are given in original script as well as in roman transcription. The catalogue does not provide any sources, though in his preface Bröker assures readers of the accuracy and integrity of the data, which largely stem from bibliographies and from the composers themselves. Because of its comprehensive approach and its wide representation of composers and works, some of which are little known and not represented elsewhere, The 20th century violin concertante is an important addition to any reference collection.