Ludwig van Beethoven's work comprises 722 larger and smaller compositions. They are registered as 138 works and groups of works with an opus number (op.) and 228 pieces without an opus number (WoO). There are to be added 27 unfinished works (Unv) as well as here not registered plans of operas and oratorios, sketches and studies.
The systematic catalogue raisonné leads to a "work homepage" for each work which features explanations and listening samples as well as important documents related to the pieces and now owned by the Beethoven-Haus: manuscripts from Beethoven (autographs), copies by professional copyists and drafts, first publications as well as work related letters and pictures. For each document, visitors can read and listen to scientific and interesting information.
For the retrieval of works by other composers see Search and Catalogues.