Beethoven Piano Sonata No. 14 in C-sharp minor Op. 27 (Moonlight) I. Adagio sostenuto

“Adagio sostenuto” is the first movement of Ludwig van Beethoven’s Piano Sonata No. 14 in C-sharp minor, Op. 27, commonly known as Moonlight Sonata. The piece is one of Beethoven's most popular compositions for the piano.