String Quartet No. 5 "The sequence of tonalities of the single sections [of the sonata form] produce the whole-tone scale".[5] "In the first movement of the Fifth String Quartet...the tonalities of the individual sections form a complete whole-tone scale (B♭–C–D–E–F♯–G♯–B♭)."[6]
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Salzman, Eric. 1974. Twentieth-Century Music: An Introduction, second edition. Prentice-Hall History of Music Series, edited by H. Wiley Hitchcock. Engelwood Cliffs, New Jersey: Prentice-Hall. ISBN0-13-935007-1.
Schoenberg, Arnold. 1978. Theory of Harmony, translated by Roy E. Carter. Berkeley and Los Angeles: University of California Press. ISBN0-520-04945-4 (cloth); ISBN0-520-04944-6 (pbk).
Tarasti, Eero. 2009. "Villa-Lobos's String Quartets". In Intimate Voices: The Twentieth-Century String Quartet, vol. 1: Debussy to Villa-Lobos, edited by Evan Jones, 223–255. Eastman Studies in Music 70. Rochester, New York: University of Rochester Press. ISBN978-1-58046-322-5.