This is a list of music-related events in 1803.
5 April – first performance of Beethoven's third piano concerto
26 December – Haydn performs his last public concert, conducting The Seven Last Words of Christ
Ludwig van Beethoven
Christus am Ölberge, oratorio
Piano Sonata No. 21 'Waldstein' started
Symphony No. 3 'Eroica'
Violin Sonata No. 7 published, composed between 1801 and 1802
Violin Sonata No. 9
Bernhard Henrik Crusell – Concerto for Clarinet no 3 in B flat major
Anton Eberl - Symphony in E-flat major, Op. 33
Joseph Haydn – unfinished String Quartet in D minor, Op 103
Franz Krommer – Concerto for Oboe in F Major (op 37)
Georg von Pasterwitz – 300 Themata und Versetten, op. 4
Giovanni Battista Viotti – Trio for 2 Violins and Cello in E major; Trio for 2 Violins and Cello in G major
Gaetano Andreozzi – Il trionpho di Alessandro
Luigi Cherubini – Anacréon
Anton Fischer – Die Entlarvten
Giovanni Paisiello – Proserpine
January 6 – Henri Herz, pianist and composer (died 1888)
April 2 - Franz Lachner, Bavarian composer/conductor (died 1890)
June 24 – George James Webb, composer (died 1887)
July 24 – Adolphe Adam, French composer (died 1856)
September 4 – Anna Nielsen, mezzo-soprano (died 1856)
December 11 – Hector Berlioz, composer (died 1869)
January 2 – Franz Ignaz von Beecke, composer (born 1733)
January 28 – Karl von Marinelli, theatre manager (born 1745)
February 5 – Giovanni Battista Casti, librettist (born 1724)
February 6 – Gasparo Angiolini, dancer, choreographer and composer (born 1731)
June 6 – Louis Gallodier, dancer and choreographer (born c.1734)
August 29 – Giovanni de Gamerra, librettist (born 1742)
September 5 – François Devienne, composer (born 1759)
September 17 – Franz Xaver Süssmayr, composer (born 1766)
September 21 – John Christopher Moller, composer and music publisher (born 1755)
date unknown
Johann Becker, organist and composer (born 1726)
Johann Christoph Kellner, organist and composer (born 1736)
1803 in music Wikipedia (Text) CC BY-SA