Final answer:
Jazz is an American music genre that developed around the turn of the 20th century, with the 1920s being a significant period of growth known as the Jazz Age, particularly associated with the Harlem Renaissance.
Step-by-step explanation:
Jazz, a vibrant and quintessentially American genre of music, developed around the turn of the 20th century, particularly during the 1920s. Often associated with the Harlem Renaissance, jazz emerged from African American communities, drawing on a variety of influences including blues, ragtime, and big band music. This era, also known as the Jazz Age, saw jazz gain widespread popularity, with New Orleans, Chicago, and New York becoming notable centers for the genre. The Cotton Club in Harlem was a famous venue where legendary jazz musicians, such as Duke Ellington and Cab Calloway, performed and helped to popularize jazz music.