B. Carlson, a prominent figure in mid-20th century jazz, was an American arranger whose innovative vocal charts redefined the sound of big bands. Known for their intricate harmonies and sophisticated counterpoint, Carlson's arrangements elevated the role of the vocal ensemble from mere accompaniment to an integral melodic and rhythmic force. Their collaborations with iconic bandleaders like Stan Kenton and Woody Herman produced groundbreaking works such as "Moonlight Serenade" reimagined for vocal orchestra and the seminal "Symphony for Voices." Carlson's contributions significantly expanded the sonic palette of jazz, influencing subsequent generations of vocal arrangers and solidifying the vocal ensemble's place within the jazz idiom.