Final answer:
The Beatles' movies were integral to their music career as they expanded their reach, shaped their public image, and reinforced their connection with youth culture during a time when rock 'n' roll was changing societal norms.
Step-by-step explanation:
The movies produced by The Beatles were influential to their musical career because they significantly shaped their image and helped spread their popularity beyond the traditional channels of radio and live performances. Just as rock 'n' roll was blurring racial lines and ushering in a new era of cultural interaction, The Beatles' films presented the group in a way that embodied the youth culture of the time, promoting a message of rebellion and individualism.
As rock 'n' roll music began to tear down color barriers and appealed to a wide audience, The Beatles leveraged the power of cinema to tell their stories, contribute to their legend, and cement their status as icons of not just music, but a cultural revolution.