BBC – Radio 4 In Our Time – China: The Warring States Period
‘In Our Time’ is a BBC radio discussion programme on a very wide range of subjects (from Angels, history of, to quantum mechanics). There is a vast archive of programmes online, including this one on the Warring States period. (Which was a very active time for Chinese thought in general and the development of the Yijing in particular. I’ve read suggestions recently that the King Wen sequence might date from this time.)
Down on the bottom right of the archive page, you’ll also find a link to a programme on the Han.