This interesting programme is ruined by the background noise throughout. Using music or sound to create atmosphere or illustrate a theme is often useful, but this programme just supplies annoying noise, an awful jangling of non-musical sounds. The only reason I can guess for it is that the producers prescribe to a nonsensical notion that noise forces the brain to concentrate more on the programme and thus avoids the viewer's attention wandering. What it does for me is to make it so annoying that I am tempted to switch off. Who on earth is responsible for this dreadful attack on viewers' senses?