When I was in my twenties, exactly 50 Edinburgh Festivals ago, Frank Dunlop directed the first professional production of Joseph and the Amazing Technicolor Dreamcoat which Andrew Lloyd Webber and I had written for a primary school concert in 1968. In the first four years of the work’s existence, it began to burrow its way into educational musical syllabi at a modest pace. This we appreciated, but in 1970 we stumbled into overnight success with our double album of Jesus Christ Superstar, and we did not thereafter give our earlier piece the attention it perhaps deserved. Superstar’s hefty impact on both record and stage did cause a certain amount of interest within musical circles, at least to the extent that theatricals wondered where these two slightly posh chaps had come from – and whether they had written anything else.