paci: The slow eighteenth variation is by far the best known, and it is often included on classical music compilations without the rest of the work. It is based on an inversion of the melody of Paganini's theme. In other words, the A minor Paganini theme is literally played "upside down" in D♭ major, with a few other changes. Rachmaninoff himself recognized the appeal of this variation, saying "This one, is for my agent."[4] (2-16 17:21)