And Berry is quite willing to talk about harmony in overlapping spheres of influence rather than as exclusive, as in his characterization of the harmony in the C-Major Prelude, WTC I:
Primary tonal elements in the Bach Prelude are, in my view, best deemed a complex of overreaching foreground occurrences, anticipating and reflecting. Two occurrences of V, conceivable as one basic manifestation, enclosed by three encompassing occurrences of I, comprise a fundamental unity of linked, overlapping events which span the Prelude ("Metric," 24).. . . the Prelude's first nineteen measures [suggest] segments marked by overreaching occurrences, prolongations, and processes, inarticulative of precise temporal spans. Particular occurrences and recurrences seeming in the graph [his Ex. 20] to mark explicit spans should be read as veiled, blinking, fading and reemerging, signals (25).
This complex treatment of harmony is, in fact, remarkably similar in its basic strategies to work by Charles J. Smith cited in an earlier post.
Berry, unfortunately, went further in his final book to assert the composer's priority, after the by-then dated manner of the 1960s and the "CMPs" (Contemporary Music Project; Comprehensive Musicianship). As Nicholas Cook puts it, "the dominant approach [to the relation of analysis and performance is] typified by Walter Berry's Musical Structure and Performance. [Its problem is] that it is prescriptive, that it proceeds from analysis to performance, [and] that it tells performers what they have to do rather than listening to what they have to play" (217). What Cook calls for is analysis that is not "monotextual," and thus Berry becomes the emblem of a (heretofore) hegemonic unmarked term.
References.
Berry, Wallace. "Metric and Rhythmic Articulation in Music." Music Theory Spectrum 7 (1985): 7-33.
Smith, Charles J. "The Functional Extravagance of Chromatic Chords." Music Theory Spectrum 8 (1986): 94-139.
Cook, Nicholas. "At the Borders of Musical Identity: Schenker, Corelli and the Graces." Music Analysis 18/2 (1999): 179-233.
Berry, Wallace. Musical Structure and Performance. New Haven: Yale University Press, 1989.