With The Archive of the Sing-Akademie zu Berlin Catalogue a complete catalogue of the music archive of the Sing-Akademie zu Berlin is now available for the first time since the archive, which disappeared during World War II, was rediscovered in 1999. Since 2001 the more than 260,000 pages of music manuscripts, copies and first prints (from 17th to early 19th cent.) were revised by two musicologists which compiled an index of shelf marks and an index of composers. Thus detailed searches in the holdings of the archive (which were filmed since 2002 in severeal parts on microfiche at K.G. Saur) are possible for the first time. The Catalogue lists 9,735 works of 1,008 different composers. It provides also a concordance signature - microfiche and therefore serves as a cumulated guide to the microfiche editions, all the more the registers have been revised and improved. The unique collection is introduced by a number of articles by musicologists Axel Fischer, Christoph Henzel, Klaus Hortschansky, Matthias Kornemann, Ulrich Leisinger, Mary Oleskiewicz, Ralph-J. Reipsch, and Tobias Schwinger.