Jerónimos Monastery, Lisbon. Watch the series 'Discovering Masterpieces', your audio-visual concert guide to the great masterpieces of classical music. The series brings you 20 half-hour documentaries on 20 classical masterpieces: acclaimed experts, famous soloists and outstanding conductors take you on a journey back to the time and place of composition. In today's documentary, Bela Bartok's 'Concerto for Orchestra' is discussed. This piece is one of the most frequently performed works of the twentieth century. Pierre Boulez explains how he interpreted this composition with the Berlin Philharmonic. He also describes its fascination against the backdrop of Bartok's biography.