Yes, it’s that time of the year again - millions across Europe tune in to the annual festival of kitsch that is the Eurovision Song Contest.

When it began 70 years ago, the idea behind the Eurovision Song Contest was to unite people through music.

It's been the crucible of music icons from ABBA to Celine Dion, a flashy symbol of European integration, the charged focal point for geopolitics and a stage for social change.