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The Symphony No. 3 in E ♭ major, Op. 55, (also Italian Sinfonia Eroica, Heroic Symphony; German: Eroica, pronounced) is a symphony in four movements by Ludwig van Beethoven.

One of Beethoven's most celebrated works, the Eroica symphony is a large-scale composition that marked the beginning of the composer's innovative "middle period".

Composed mainly in 1803–1804, the work broke boundaries in symphonic form, length, harmony, emotional and cultural content. It is widely considered a landmark in the transition between the Classical and the Romantic era. It is also often considered to be the first Romantic symphony. Beethoven first conducted a private performance on 9 June 1804, and later the first public performance on 7 April 1805.