(noun) a parenthetical flourish in an aria or other solo piece commonly just before a final or other important cadence / (noun) a technically brilliant sometimes improvised solo passage toward the close of a concerto / (noun) an exceptionally brilliant part of an artistic and especially a literary work
in mad cadenzas of simian gibberish that break suddenly into glorious soliloquies, then plunge again into nonsense
quoting from a negative review of Brief Interviews in the NYT