Carmen is among the most popular operas for all the obvious reasons: great characters, a gripping story and fabulous music. But what sets it on a pinnacle is an amazing combination of three factors: a sizzling gipsy heroine (one of the most psychologically complex and compelling characters in all theatre), great atmosphere (Spain, hot sun, the bull-ring) and the prodigality of melodic invention – one great tune after another, at least a dozen of which are the staples of Madison Avenue and the animated cartoon.