In Chamber Orchestra and Ensemble Repertoire, Dirk Meyer provides conductors, musicians, and librarians with all the information needed to plan their performances of modern chamber music. Meyer lists almost 4,000 works written during the 20th and 21st centuries, representing more than 1,100 composers. Entries are divided into three categories: Chamber Orchestra, String Orchestra, and Ensemble. Presented alphabetically by composer, each entry fully describes the composition, including its duration, year of composition, availability and publisher, and complete instrumentation. The comprehensive appendix allows users to search for repertoire based on a variety of criteria, including instrumentation, duration, solo instruments, and solo voices. As a catalog of modern music, the appendix also provides categories for 21st-century repertoire as well as compositions that require the use of electronics. Finally, an additional appendix offers arrangements for chamber orchestra or ensemble that were made by the "Verein für musikalische Privataufführungen" (Society for Private Musical Performances), a group of composers active in the early 20th century under the guidance of Arnold Schönberg. This valuable resource is complete with a list of publishers and bibliography.