Ludwig van Beethoven, Brief an Breitkopf & Härtel in Leipzig, Wien, 6. Mai 1811, mit beigefügtem Fehlerverzeichnis, Autograph

Beethoven sends his Leipzig publisher a list of mistakes for the works op. 84 and op. 82 as well as further comments for op. 80 and op. 73. Beethoven criticizes the numerous mistakes in the proofs with bitter irony.