The composer known for their contributions to classical music and symphonies is Ludwig van Beethoven. His works, including the "Symphony No. 9" and "Moonlight Sonata," have left a lasting impact on the music world. Beethoven is celebrated for his ability to convey deep emotions and innovative compositions, bridging the classical and romantic eras. His music reflects the struggles and triumphs of his life, particularly his battle with deafness, which adds a profound layer to his creative legacy.