The holdings of the Weill-Lenya Research Center include the following record groups: the Main Collection (including the Lotte Lenya Papers), the Yale Collection, and the Kurt Weill Foundation Archives.
The Main Collection consists of the items acquired from Lenya's estate and all subsequent acquisitions to the Weill-Lenya Research Center. The collection is organized into 80 series numbered (with gaps to accommodate future growth) 1-144. A series list indicates the arrangement of the different kinds of material held by the WLRC.
In keeping with the concept of a Research Center as distinct from an archives or manuscript repository, and because a great part of the collection was acquired item-by-item rather than in large collections, most new acquisitions were processed into series derived from Lenya's arrangement of her documents or into new "artificial" collections. Some of the material found in these collections was acquired as a result of the business activities of the Foundation, especially music manuscripts and rental materials, scripts, audio and videotapes, press clippings, programs, and other performance documentation.
The Yale Collection consists of 48 boxes of photocopies (mostly from microfilm) from the Yale University Music Library collection MSS 30: The Papers of Kurt Weill and Lotte Lenya, which was formally donated by the Kurt Weill Foundation for Music to Yale in 1983. A register edited by Adrienne Nesnow which lists the contents of each folder of each series is available under the title Yale University Music Library Archival Collection MSS 30, The Papers of Kurt Weill and Lotte Lenya (New Haven, Conn.: Yale University Music Library, 1984).
The Kurt Weill Foundation Archives holds the business records of the Foundation. Primary series include General Business Correspondence; Publisher Correspondence; Production Correspondence; Publishing, Recording and Video Projects; Foundation Projects; Minutes of the Board of Trustees; Financial Records; Contracts; and Administrative Files. Access is restricted by Foundation policy.