2. For a recent survey of the prominent theoretical texts on cadenza in the eighteenth century, see Joseph P. Swain, “Form and Function of the Classical Cadenza,” Journal of Musicology 6 (1988): 27–59. Curiously overlooked here, it was August Friedrich Christoph Kollmann who most clearly abstracted the principles that govern the Classical cadenza, in An Essay on Practical Musical Composition (London: “printed for the author,” 1799; reprint New York: Da Capo Press, 1973), 22–33 and plates 10 and 11.