Final answer:
Tin Pan Alley greatly influenced film after the integration of sound in movies which began in 1927 with 'The Jazz Singer', bringing popular music directly into the cinematic experience and contributing to the industry's success.
Step-by-step explanation:
Tin Pan Alley, a historical term describing a collection of New York City music publishers and songwriters who dominated the popular music of the United States in the late 19th century and early 20th century, would become a significant part of film after its integration into mainstream culture and especially after the advent of sound in movies in 1927 with films like The Jazz Singer. The movie industry capitalized on this by including popular music in their films, which resonated with audiences. Even during times like the Great Depression and beyond, music from Tin Pan Alley provided a sense of escapism and nostalgia, featuring in many films that brought comfort and entertainment to the masses.
With the growth of the film industry in the 1920s and the later integration of sound, the unique musical styles from places like Tin Pan Alley began to find their way onto the big screen, reinforcing the existing cultural connections and further fueling the success of both the music industry and Hollywood as a backdrop for America's cinematic stories and the popular culture of the time.