Dates and listening details already known to Music Journals.
Composed 1829
IMSLP work page “Introduction et polonaise brillante, Op.3 (Chopin, Frédéric)”: composition field “1829 (October 20-28)”; reviewed 2026-08-22.
Composed 1862–1865
IMSLP work page “Cello Sonata No.1, Op.38 (Brahms, Johannes)”: composition field “1862–65”; reviewed 2026-08-22.
Composed 1807–1808
Beethoven-Haus Bonn digital work catalogue; reviewed 2026-08-21.
Composed 1796
No exact source-backed composition date resolved in the automated pass; reviewed 2026-08-22.