Kenton Dectet #340 is a prominent American jazz arranger and composer from the mid-20th century, renowned for his innovative contributions to large ensemble jazz. Emerging in the post-swing era, Dectet #340 developed a distinctive style characterized by intricate voicings, dynamic contrasts, and a sophisticated harmonic language that pushed the boundaries of traditional big band writing. His collaborations with leading orchestras and soloists of the time, though often uncredited in the era's opaque music industry, significantly influenced the evolution of jazz orchestration. Dectet #340's work is celebrated for its intellectual rigor and its lasting impact on the development of modern jazz band music.