The "Moonlight Sonata" was composed by Ludwig van Beethoven. Formally known as Piano Sonata No. 14 in C-sharp minor, Op. 27, No. 2, it was completed in 1801 and is one of Beethoven's most iconic pieces. The composition features a unique and haunting first movement, which is often associated with moonlight, leading to its nickname. The sonata has three movements, each showcasing Beethoven's innovative style and emotional depth. The "Moonlight Sonata" highlights his ability to blend lyricism with complexity, making it a staple in classical piano repertoire and a favorite among both performers and audiences alike.