B. Lowden, an American jazz arranger active primarily from the 1940s through the 1970s, was a significant, albeit often uncredited, force in big band and small ensemble jazz. Known for his sophisticated harmonic voicings and innovative sectional writing, Lowden’s arrangements blended traditional swing elements with emerging bebop sensibilities. He contributed charts to numerous prominent orchestras, including those led by Count Basie and Stan Kenton, and his work is characterized by its intricate counterpoint and dynamic range. Lowden's arrangements were instrumental in shaping the sound of several iconic recordings, influencing generations of jazz musicians and arrangers with his distinctive approach to ensemble orchestration.