20. Grand Septet for violin, viola, violoncello, horn, clarionet, bassoon, and double-bass, in E flat; performed 1800.
21. First Symphony for orchestra, in C major; dedicated to the Baron van Swieten; performed 1800.
22. Grand Sonata for piano, in B flat; dedicated to the Count von Browne; composed 1800.
23. Sonata for piano and violin, in A minor; dedicated to Count Moritz von Fries; published 1801.
24. Sonata for piano and violin, in F major; dedicated to Count Moritz von Fries; published 1801 (originally together with Op. 23).
25. Serenade for flute, violin, and viola, in D major; published 1802.
26. Sonata for piano, in A flat; dedicated to Prince Lichnovsky; composed 1801.
27. Two Sonatas quasi Fantasia, for piano, No. 1, in E flat major, dedicated to the Princess Lichtenstein; No. 2, in C sharp minor, dedicated to the Countess Julia Guicciardi; composed 1801 (?).
28. Sonata for piano, in D major; dedicated to M. von Sonnenfels; composed 1801.