The collection primarily comprises musical works notated and published by RR Klein or approved for publication. It includes:
The collection also encompasses 104 works and series of works by RR Klein on various recording formats (CDs, long-playing records, single records, audio cassettes). Additionally, it contains copies of documents related to the composer's biography, the significance of his musical creations, and his composition theory.
Prof. Dr. Wilbert has meticulously documented the components of his collection, including:
All works and lists can be found in the "List of works by the composer Richard Rudolf Klein."
The city of Landau in der Pfalz has committed to preserving and maintaining this invaluable collection, creating a lasting RR Klein archive. The archive is situated in the Nußdorf district and is independently managed by the district. It is open for public viewing and accessible upon request.