See also: other events in 1804, 1804 in literature
Beethoven's Piano Sonata No. 22 in F major written
Beethoven's Opus 85 Christus am Ílberge completed
Beethoven angrily renames his Third Symphony from the Napoleon to the Eroica after Napoleon crowns himself emperor.
March 14 - Johann Strauss I, Austrian composer
June 1 - Mikhail Glinka, Russian composer