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In the FQS, the plot of set classes relies on their harmonic qualities\u2014such as diatonicity and octatonicity\u2014enabling us to (1) identify the pitch-class set in a musical phrase that best represents its qualia\u2014a reference sonority; (2) define a harmonic progression using all sequential reference sonorities in a piece; (3) visualize trajectory in space; and (4) establish a statistical metric for the ambiguity of harmonic qualia. Finally, we discuss Schoenberg\u2019s Op. 19, No. 1, analyzing the sense of its harmonic path. The proposed space leverages a bipartite, symmetrical, and consequential structure and unveils ambiguity as an element of nondirected linearity and counterpoint.<\/jats:p>","DOI":"10.1093\/mts\/mtaf016","type":"journal-article","created":{"date-parts":[[2025,8,28]],"date-time":"2025-08-28T11:44:11Z","timestamp":1756381451000},"page":"126-151","source":"Crossref","is-referenced-by-count":0,"title":["Qualia Motion in Fourier Space: Formalizing Linear, Nondirected, and Contrapuntal Ambiguity in Schoenberg\u2019s Op. 19, No. 1"],"prefix":"10.1093","volume":"48","author":[{"given":"Samuel","family":"Pereira","sequence":"first","affiliation":[]},{"given":"Gilberto","family":"Bernardes","sequence":"additional","affiliation":[]},{"given":"Jos\u00e9 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