Sentence:  In all his miscalculations , Stravinsky made the fatal historical blunder of presuming that he could transform other composers ' inspirations - representing many peoples , time periods and styles - into his own music by warping the harmony , melody , or <WSD>form</WSD> , to verify his own experiments . 
Meaning of the word marked with <WSD> tags:  a category of things distinguished by some common characteristic or quality