Alan Yentob is granted an audience in the dressing rooms of some of the great operatic divas of today, from Angela Gheorghiu and Renee Fleming to Kiri Te Kanawa and Frederica von Stade. He explores what it takes to survive and succeed in this ultra-competitive world, for both stars and newcomers, and asks if these singers still need to be divas - in the modern sense of the word - to get to the top in this business.