The Edinburgh Festival was founded 70 years ago in the aftermath of World War Two. 1947 was a year of shortages and rationing, and the idea of starting an arts festival in Scotland's capital city must have seemed highly ambitious. Yet with the support of the Lord Provost of Edinburgh, Rudolf Bing, the general manager of Glydenbourne Festival Opera, undertook the challenge. It was to prove an international success that has lasted 70 years. With contributions from those who attended the first festivals in the 1940s and music from early performances, Jim Naughtie reflects on the origins of what has become the world's greatest arts festival. Producer Mark Rickards.