The composer of the "Fifth Symphony" is Ludwig van Beethoven. This symphony, officially known as Symphony No. 5 in C minor, Op. 67, is one of his most well-known works and was completed in 1808. It is widely celebrated for its four-note motif, which is often interpreted as "fate knocking at the door." The piece is a significant part of Western classical music and has influenced many composers after Beethoven. Its dramatic and powerful themes have made it a staple in orchestral repertoire and popular culture, with many performances and adaptations across various media.