The Arnold Schoenberg Center’s holdings consist of the composer’s estate, which forms the archive’s core inventory, as well as various special collections. A large number of databases, most of which already digitally linked, are available for research.The works and sources catalog documents all sources directly connected with Schoenberg’s musical oeuvre, including manuscripts, personal copies, score parts and text sources, taking into account those from the estate, other collections and archives; about 8,000 pages are already digitized and accessible via the database. The text database comprises all writings from Schoenberg’s estate and links them completely to digitized material and, in many cases, transcriptions. The letters database contains all of Schoenberg’s correspondence known at present; the Correspondence Estate at the Library of Congress in Washington D.C. is already linked to digitized versions, with letters in the Schoenberg Center archive being successively augmented. The image archive has been structured as a comprehensive aggregate database to bring the archive’s diverse holdings into alignment. Currently, this includes photographs (mostly taken during Schoenberg’s lifetime), teaching materials (particularly from his private tutoring in the U.S.A.), address cards filed until the 1940s, concert programs from his estate, personal documents (attestations, credentials, residence registrations, etc.), materials concerning the Society for private performances, as well as paintings and other artistic works. The press archive contains all such items in his estate, with links to digitized versions as well as a constantly updated catalog of acquired items concerning Schoenberg up to his death in 1951. The discography consists of commercial recordings of Schoenberg’s music made until 2009. Audio streams of selected historical recordings as well as voice recordings are available. The video collection is documented in a separate catalog.