B. Belden, an influential American jazz arranger of the mid-20th century, was a pivotal figure in shaping the sound of big band jazz. Known for his sophisticated harmonic language and innovative voicings, Belden's arrangements seamlessly blended swing era traditions with emerging bebop sensibilities. His collaborations with prominent bandleaders like Count Basie and Duke Ellington resulted in several iconic recordings, lauded for their intricate counterpoint and dynamic orchestration. Belden's contributions extended beyond individual charts; he developed new techniques for sectional writing, expanding the expressive capabilities of the jazz orchestra and leaving an indelible mark on the genre's evolution.