Leo Forbstein (1899–1968) was an influential American conductor and arranger, primarily known for his work in the music industry during the early to mid-20th century. He was associated with the genre of orchestral and popular music, particularly within the context of film scores and big band arrangements. Forbstein gained significant recognition as the musical director of Warner Bros. Studios, where he contributed to numerous films and helped shape the sound of Hollywood's golden age. His notable works include orchestral arrangements for classic films such as “The Jazz Singer” (1927), which was pivotal in the transition to sound in cinema, and “Casablanca” (1942). He was known for his innovative arrangements that blended classical music elements with contemporary popular styles, influencing the sound of film music and orchestral arrangements during his time. Forbstein's impact extended beyond film; he played a crucial role in the evolution of American popular music, setting the stage for future composers and arrangers in the industry. His legacy lies in his ability to seamlessly integrate various musical styles, thus enriching the cinematic experience and the broader landscape of American music.