Meet the man who makes a piano master sound great in this fascinating documentary about Steinway & Sons Master Tuner Stephan Knüpfer. In this intimate profile of Knüpfer and the intensely demanding work he completes in advance of artists like Lang Lang, Alfred Brendel, Pierre-Laurent Aimard, and others taking to the keys, the film reveals how the line between perfectionism and madness can sometimes feel blurred. 93 min. Widescreen; Soundtrack: English and German Dolby Digital 5.1; Subtitles: English. In English and German with English subtitles.