The discourse in Corporation proceeds along two axes. The first is amplitude variation, which is found in three forms: absent, regular, and irregular. The second axis is that of the harmonic content of the materials, divided into two principal categories: industrial materials- inharmonic, and the human voice- harmonic. I would like to thank Louis Lavigueur and the choir of the Conservatoire de Musique de Montreal for their beautiful sound recordings. And I wish to thank Laurent Marcoux for the visits to the sawmills in the Amossoise region.