Chopin Nocturne in E minor, Op. posth. 72

Frederic Chopin wrote this Nocturne in E minor in 1827. It was his first piece of the kind, and the final result did not satisfy him, so it wasn't published until 6 years after his death, in 1855. Now it is usually referred to as Op. posth. 72. It consists of 57 bars in common time, with the tempo marked Andante.