Johann Sebastian Bach's chorale settings have been vital to the teaching of music ever since they were composed. His four-voiced harmonisations represent a Baroque composer's approach to melodies that are often centuries older. As musical styles continued to evolve, each succeeding generation of teachers and students brought their own viewpoint to bear on this small corpus of music. Consequently, during the three centuries since their composition and a quarter of a millennium since their first publication, a range of contrasting ideas and approaches has tended to obscure the fundamental...