Whenents a significant leap in production philosophy. Early stereo mixes often feel quite primitive, with hard-panning that separates the rhythm section from the vocals entirely. In your view, which engineer or band first utilized the 4-track or 8-track system to create a truly immersive soundstage rather than just a split signal? I personally find that 'Pet Sounds' set a benchmark for depth that many others struggled to match until much later in the decade. Would love to hear some technical perspectives on this