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The Komponisten der Gegenwart is the only music lexicon that focuses exclusively on 20th- and 21st-century composers. Musicologists Hanns-Werner Heister and Walter Wolfgang Sparrer founded the lexicon in 1992 and conceived it in loose-leaf format to ensure that its content could be continuously updated and expanded. It currently contains biographical and work-related information on about 850 composers. Each entry is divided into two sections: the first is biographical, providing an overview of life and achievement; the second is work-oriented, with information on aesthetic and compositional technique based on historical and analytical assessment. Over 200 entries feature exhaustive works lists, selective discographies, and curated bibliographies. The KDG contains a wealth of information, especially on lesser known composers who have recently emerged; it is unique as it is updated quarterly (these updates are included in RILM Music Encyclopedias), thus being not only a bestseller but a longseller.

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.