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Starting with only seven countries, the Eurovision Song Contest now has 40 participants. Shows such as Pop Idol have followed in its wake - but Eurovision is different in an important way: votes are cast for a country, not a singer, which can lead to some interesting tensions and gameplaying. Nicola Clase, Swedish ambassador to the UK and Karen Fricker, professor and critic, discuss.

Image: the Eurovision brand image, 2016 Credit: Eurovision