Final answer:
Big band jazz became the definer of popular culture in the 1930s and 1940s due to its catchy music, cultural significance, and association with the entertainment industry.
Step-by-step explanation:
Big band jazz, also known as swing, became the definer of popular culture in the 1930s and 1940s due to several key factors. Firstly, the music itself was highly energetic and infectious, making it appealing to a wide audience. Additionally, jazz was born out of the African-American community and carried a powerful sense of cultural identity, which resonated with people during a time of social and cultural change.
Moreover, the entertainment industry played a significant role in popularizing big-band jazz. Jazz clubs, such as the Cotton Club in New York, attracted large audiences of young and white individuals who were drawn to the vibrant atmosphere and performances of Black musicians. Furthermore, the emergence of new dances, such as the Charleston, further propelled the popularity of jazz as people wanted to dance to the upbeat and lively music.
Overall, big band jazz became the definer of popular culture in the 1930s and 1940s due to its catchy music, cultural significance, and association with the entertainment industry.