Rolf Trostel is a protagonist of the so-called Berlin School, to which belong such artists as Tangerine Dream and Klaus Schulze. Electronic Pop was the musical goal of Trostel's third album "Der Prophet", which was released in the same year as its predecessor "Two Faces". "Der Prophet" is the culmination of this phase of Trostel's oeuvre, which was tightly coupled to the PPG Wave Computer.