Mathematics as the basis of western musical harmony and how J. S. Bach loved numbers

Famed mathematician Pythagoras — he of the right-angled triangle theorem — discovered mathematical principles which J. S. Bach used in his compositions. Violinist and artistic director of Bach Akademie Australia Madeleine Easton, and composer and conductor Christopher Bowen describe how mathematical principles form the basis of western musical harmony and how J. S. Bach used mathematics in his compositions.