10cc was certainly not one of the greatest rock groups of all time, but its 1975 hit, “I’m Not in Love” is often in the debate as the best romantic rock song ever. In this fascinating — and short — documentary, BBC goes behind the song to see how it almost failed to launch. The process of its creation can best be described as “clumsy,” but the finish product was astonishing. A wonderful story about an amazing song. The segment wraps up with the airing of the masterpiece.