Sid Ramin and Irwin Kostal were influential American orchestrators and arrangers, primarily active from the mid-20th century onwards. While not strictly jazz musicians, their sophisticated arranging techniques profoundly impacted the sound of large ensembles, including those with jazz leanings. They are best known for their work on Broadway musicals and Hollywood films, notably collaborating on the iconic scores for "West Side Story" and "Gypsy." Their arrangements, characterized by lush harmonies, intricate counterpoint, and dynamic instrumentation, elevated the orchestral landscape and provided a blueprint for how big bands could integrate classical precision with popular music sensibilities, indirectly influencing jazz band scoring and performance.