What is spontaneous creativity? I imagine a kind of spring, no, rather a waterfall. Something gushes forth, seemingly eternally, effortlessly and never running dry, from the pen of Domenico Scarlatti, from the fingers of Christoph Ullrich. An unimaginative person like me thinks: That's it now. He can't think of another sonata that doesn't repeat something long since invented. But yes, there's another one! New again, different again, freshly born again. What do 555 sonatas mean? It means: an infinite number of sonatas, let anyone count them. This is exactly how Christoph Ullrich proceeds in the 12th of 17 episodes. Not only is every new Scarlatti sonata unique, but every version that Ullrich plays is also new. He cannot play such a unique piece the same way twice. He keeps telling me during the recordings: turn the tape back on, I'll try something else. Both like children at play, endlessly creative. Every version is bursting with ideas, every bar, every take. Every day, every second. All double unique! Domenico's Ullrich? Christoph's Scarlatti!