R. Pompilio, an American jazz arranger active primarily from the late 1960s through the 1980s, was a significant figure in big band and studio ensemble music. Known for his sophisticated harmonic palette and inventive voicings, Pompilio's arrangements blended traditional jazz with contemporary influences, often incorporating elements of funk and fusion. He collaborated with numerous prominent artists, including orchestrating for several Motown acts and contributing arrangements to the Tonight Show Band. His work is characterized by its meticulous detail and ability to elevate melodic lines through rich, complex accompaniment, making him a sought-after arranger for both live performance and recording sessions.