Allan Horney, an American jazz arranger active from the mid-20th century, significantly shaped the sound of big band and orchestral jazz. Known for his sophisticated harmonic voicings and innovative instrumentation, Horney’s arrangements bridged the gap between swing and modern jazz. He notably collaborated with prominent bandleaders like Stan Kenton and Count Basie, contributing to iconic albums such as "City of Glass" and "The Atomic Mr. Basie." Horney's meticulous scores and imaginative use of orchestral colors left an indelible mark on jazz band literature, influencing generations of arrangers with his forward-thinking approach to large ensemble writing.