George Perle (1990) has argued that this amounts to "Tradition in 20th Century Music", the most significant element of which is the "shared premise of the harmonic equivalence of inversionally symmetrical pitch-class relations," among composers such as Edgard Varèse, Alban Berg, Béla Bartók, Arnold Schoenberg, Alexander Scriabin, Igor Stravinsky, Anton Webern, and himself.