Editing Combinatoriality (section)

==Trichordal combinatoriality==
{{Image frame|content=<score sound="1">
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        b1 bes d  
        es, g fis  
        aes e f  
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</score>|caption=[[Tone row]] for [[Anton Webern|Webern]]'s [[Concerto for Nine Instruments (Webern)|Concerto for Nine Instruments Op. 24]].<br />An all-combinatorial [[derived row]] composed of four [[trichord]]s: P RI R I.|max-width=}}'''Trichordal combinatoriality''' is a row's ability to form aggregates through the combination of trichords. "Trichordal combinatoriality involves the simultaneous presentation of four rows in parcels of three pcs."<ref>Morris, Robert (1991). ''Class Notes for Atonal Music Theory'', p. 82. Frog Peak Music. {{ASIN|B0006DHW9I}} {{No ISBN}}.</ref> The existence of trichordal combinatoriality, or any other form, in a row does not preclude the existence of other forms of combinatoriality (at the least trivial hexachordal combinatoriality exists between every row form and its retrograde). All trichordally derived rows possess trichordal combinatoriality.