This was later to evolve into Spector's Wall of Sound, which Leiber and Stoller consider to be very distinct from what they were doing, stating: "Phil was the first one to use multiple drum kits, three pianos and so on.
Detta kom senare att utvecklas till Spectors Wall of Sound, som Leiber och Stoller anser vara mycket annorlunde från det de gjorde: "Phil var den första att använda flera trumset, tre pianon och så vidare.