Of Musical Notes and Their Virtue
Perrone Compagni — Table of Comparison
1533 edition (2:24): W, 2: 32 + many additions
This chapter, De musicali harmonia eiusque viribus ac potentia (“Of Musical Notes and Their Virtue”), occupies a significant place in Agrippa's systematic exposition of occult philosophy. In the 1533 Cologne printed edition (De occulta philosophia libri tres, sigla K in Perrone Compagni's critical apparatus), the text represents Agrippa's mature formulation of the ideas it addresses, the product of over two decades of reading, travel, and revision since the composition of the Würzburg draft.
This chapter derives from W 2:32 of the Würzburg draft, but has been substantially expanded — Perrone Compagni notes many additions. The scale of interpolation suggests Agrippa rethought and broadened the original argument considerably; the 1533 text is in essence a new development of the earlier material rather than a simple revision.
The extent of revision in this chapter illustrates the dynamic character of Agrippa's rewriting process. Rather than simply updating facts, he appears to have substantially reconfigured the argument. Comparison with the partial edition A — which represents an intermediate stage — may reveal whether the additions were introduced gradually or in a single later revision.
Agrippa's Argument
The chapter opens Agrippa's treatment of musical effectus with a bold cosmological claim: music is not merely a phenomenon that affects the soul but a structured expression of celestial harmony itself. Drawing on Tinctoris's Complexus effectuum musices as his immediate source, Agrippa reframes the late-medieval catalogue of musical effects as a demonstration of how celestial order operates through sound on embodied human beings. The move is to make music technology rather than merely art: understanding the celestial basis of musical harmony enables the practitioner to compose and deploy music that directs affective and somatic states deliberately. This is the positive pole of a diptych whose negative pole is Agrippa's devastating critique of degenerate contemporary music in De incertitudine — he attacks the degraded practice precisely because he holds the standard of what music at its best is and does.
Scholarly Perspectives
Schipperges (2001) places De occulta philosophia II.24 at the center of his comparative study of Agrippa's two seemingly contradictory treatments of music, arguing that the chapter establishes the general rubric — that musical harmony 'changes the affects, intentions, gestures, movements, acts, and customs of all listeners and suddenly provokes them to its own properties' — under which all subsequent specific effectus in II.24–28 are organized. By mapping this rubric against Tinctoris's Complexus effectuum musices in a parallel table, Schipperges demonstrates that Agrippa is working within and against a recognizable late-medieval music-theoretical tradition, selecting and reordering Tinctoris's twenty categories to serve his own occult-philosophical synthesis. The methodological stakes of this reading are considerable: Schipperges uses II.24 not merely as a source of content but as the positive pole of a deliberate compositional diptych, arguing that the notorious skeptical chapter in De incertitudine et vanitate scientiarum (ch. 17) should be read as a systematic negation of the effectus catalogue opened here, rather than as evidence of intellectual incoherence or a late change of heart. This positions Agrippa as a strategically self-aware author who structured his two major works in dialectical relation, and it situates II.24 historiographically as a pivotal text in the debate over Agrippa's unity of purpose.