What is it about some great artists that makes them want to be someone else? Sir Arthur Conan Doyle, the father of Sherlock Holmes, aspired to be a historical novelist like Leo Tolstoy or Fyodor Dostoyevsky, neglecting that he created some of the finest detective fiction of all time. François Truffaut was in awe of Alfred Hitchcock, even though many thought his own films as complex, mysterious and beguiling as Hitchcock’s. Marvin Gaye had his sights set on becoming another Frank Sinatra. At least that’s the inference we take from his biographer, David Ritz. In his book “Divided Soul,” Ritz quotes Gaye: “Everyone wanted to sell to whites ‘cause whites got the most money,” adding that, at Motown, his record label, “Our attitude was — give us some.”