Our whole being responds to music. Using examples from the Beatles to Bach, Horizon looks at the factors - physical, psychological and social - that make up the magic of music. Just how far can we succumb to the influence of music? The programme examines the work of the Muzak Corporation of the USA, whose carefully programmed product could be moving on from the supermarkets and restaurants of today to the schools and colleges of tomorrow. https://youtu.be/LkgNP5GWE-k