Music from the Earliest Notations to the Sixteenth Century

20 Edward E. Lowinsky, “The Concept of Physical and Musical Space in the Renaissance,” Papers of the American Musicological
Society (1941): 57–84; rpt. in E. Lowinsky, Music in the Culture of the Renaissance and Other Essays, ed. Bonnie J. Blackburn
(Chicago: University of Chicago Press, 1989), pp. 6–18 (quote is on p. 11).