occurs at only three different points (not counting the repetition in bar 3), each initiating a new and major formal subdivision of the piece."

Timothy Kloth interprets the head motif or, "the molecular structure around which the entire composition is cast," as being the five-pitch-class motive which opens the piece, F-E-F-C-G. This is divided into two trichords: "cell X" (also Perle's head motif, F-E-F) and "cell Y", F-C-G.

Recordings

George Perle and Marc Wilkinson, in writing,

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