'in addition to quoting two themes from the first movement, rachmaninov introduces four other themes, one after the other, in the finale. the first three (mm. 3-5, 39-40, 74-78) are rhythmically vital, and the last (mm. 103-107) passionately soaring. succinct variations of the first fill the development section. in the recapitulation, the third idea, with its repetitious chordal syncopations and crescendo, builds to the climax of the soaring fourth theme, which shares the general contour of the third theme. the tonal scheme of the recapitulation is unorthodox. the first theme returns in c minor, while the second begins in b-flat and moves to f, and the third remains largely centered in F. very tricky, but optional, woodwind passages, emphasizing lightening-fast triplets, augment the tension of the mounting syncopated chordal theme. in the consummate mastery with which rachmaninov constructed the final climax of this ultimate virtuoso concerto, we sense this pianist-composer's overriding concern to locate points in others' works that he could carry tot he utmost peak.
some years passed before other pianists could master this extraordinarily difficult concerto; among a few who did was the ukranian-born vladimir horowitz (1904-1989), who became one of the work's principal interpreters. in the late 1920's and early 1930's, rachmaninov made several cuts in the score he used for his own performance of the concerto, urging horowitz to do likewise, in order to ease the demands and reduce the sheer volume of notes to be played in what is a test of endurance. thankfully, several modern performers are now capable of performing the entire work in its original form, so it is now usually heard in that form.'