Eric Clapton is God, Michael Jackson is the King of Pop, Aretha Franklin is the Queen of Soul and Ella Fitzgerald is the First Lady of Song. Many a pop star's musical achievements have been accorded a superlative nickname - regal or spiritual - that places them at the very top of their tree. Sometimes the title is self-administered, sometimes it comes from ardent fans or journalists, but the question is, can you tell which star is which, just from their honorific nickname alone?