"Pianomania" follows Stefan Knüpfer, Steinway & Sons' master tuner in Vienna, as he works with some of the world's best known concert pianists, including Lang Lang, Pierre-Laurent Aimard and Alfred Brendel. Warm, and at times gently humorous, the film reveals how unsung hero Knüpfer is pivotal to realising the vision of each virtuoso, showing us the art, the science and the passion behind the search for perfection.