Oh, you thought the Eurovision Song Contest was about songs? Or a fun international TV event that brings people together in lots of different countries? Or watching extremely vigorous dance numbers? OK, it is, but it's also about some pretty thorny language-related politics. Historian Dean Vuletic, author of Postwar Europe and the Eurovision Song Contest, discusses Eurovision's many linguistic controversies, and the ways the contest has been exploited politically - and caused political kick-offs too.