The music of this piece had been written by the Polish composer and Jazz Pianist Krzysztof Komeda (died 1969). He had written a lot of film music for Polish film director Roman Polański.This particular piece is from the film Rosemary's Baby. It is the lullaby the main character (Mia Farrow) sings to her child, which is also the devil's child. The beautiful lyrics had been written later by Wojciech Młynarski.