Chopin Nocturne in C-sharp minor, Op. posth 

The Nocturne No. 20 in C-sharp minor, Op. posth., Lento con gran espressione, P 1, No. 16, KKIVa/16, is a solo-piano piece composed by Frédéric Chopin in the Romantic Period in 1830.
Chopin dedicated this work to his older sister, Ludwika Chopin, with the statement: "To my sister Ludwika as an exercise before beginning the study of my second Concerto".First published 26 years after the composer's death, the piece is usually referred to as Lento con gran espressione, from its tempo marking. It is sometimes also called Reminiscence. The piece was famously played by Holocaust survivor Natalia Karp for the Nazi concentration camp commandant Amon Goeth, with Goeth being so impressed with the rendition, that he spared Karp's life