"4 horns + Rhythm - Montrose - Dave Pell Octet" refers to a specific ensemble configuration and a prominent West Coast Jazz group, rather than a single individual. The Dave Pell Octet, active primarily in the 1950s, was a significant American jazz ensemble known for its polished, melodic, and accessible West Coast Jazz sound. Pell, a tenor saxophonist, led the group, which typically featured four horns (often including trumpet, trombone, and two saxophones) plus a rhythm section. Their arrangements, often by Shorty Rogers and Bill Holman, emphasized tight harmonies and a swinging, yet relaxed, feel. The "Montrose" likely alludes to tenor saxophonist Jack Montrose, a key arranger and contributor to the Octet's distinctive sound. Their work helped define the cool jazz aesthetic of the era, producing numerous recordings for RCA Victor and contributing to the popularization of sophisticated, small-group jazz.