At which famous Harlem nightclub did Duke Ellington develop his "jungle music" jazz style?

Duke Ellington developed his "jungle music" jazz style primarily at the Cotton Club, which was a renowned nightclub in Harlem during the 1920s and 1930s. The Cotton Club was significant not only for its music but also for its status as a premier venue for African American performers during a time of widespread segregation. It showcased some of the finest talents in jazz, including Ellington himself, and it was known for its elaborate stage productions and themed performances.

Ellington's work at the Cotton Club allowed him to experiment with new sounds and styles that would become characteristic of his music, particularly during the early years of his career. The term "jungle music" emerged from the exotic and vibrant atmosphere of the club's performances, reflecting the rhythmic and harmonic innovations that Ellington introduced. His pieces often incorporated syncopation, powerful brass sections, and unusual orchestration, which contributed to the establishment of jazz as a sophisticated art form.

The other venues mentioned were important in their own right but did not play the same pivotal role in the development of Ellington's jungle music style as the Cotton Club did.