On April 9, 1968, a historic recording session took place at the RCA studio in Hollywood, where composer Krzysztof Komeda, jazz pianist and Polish jazz legend, worked alongside director Roman Polanski to create the soundtrack for the psychological horror film Rosemary's Baby. The film, which follows a young woman’s harrowing pregnancy amid sinister events, demanded a score that blended tension, emotion, and artistry. Komeda, known for his innovative approach, fused jazz, avant-garde, and classical elements, incorporating unconventional techniques like plucked strings and ghostly flute echoes. The session, attended by Polanski, photographer Marek Niziński, and a talented orchestra, captured the cultural spirit of the late 1960s, blending influences from rock, pop, and Polish contemporary classical music. The result was a haunting, timeless score that amplified the film’s psychological depth and paranoia.Komeda and Polanski’s collaboration was a cornerstone of their careers, their partnership was marked by mutual trust and creative freedom, with Komeda’s scores enhancing Polanski’s storytelling. For Rosemary's Baby, Komeda’s minimalist, dissonant compositions mirrored the protagonist’s unraveling reality, creating an atmosphere of dread without relying on traditional horror tropes. The soundtrack, featuring a haunting lullaby sung by Mia Farrow, became an integral part of the film’s success, earning critical acclaim and solidifying its status as a cult classic.The film’s production was marked by creative tensions, particularly between Polanski and producer William Castle, who clashed over artistic control. These conflicts, along with the intense recording sessions, contributed to the film’s layered intensity. Tragically, the film’s success was overshadowed by personal and public tragedies. Komeda died in 1969 following a mysterious accident, and Polanski faced legal troubles and personal demons, including the Manson family’s murder of his wife, Sharon Tate. Despite these events, Rosemary's Baby remains a landmark in cinema, with Komeda’s score redefining the role of music in horror and influencing generations of filmmakers and composers. His legacy endures as a testament to the power of music in storytelling.