One of music's true global superstars and most admired figures, Elton John has sold an estimated 200 million albums worldwide to date, and continues to appear regularly in the singles charts, thanks largely to a series of high-profile collaborations with new faces. But he is loved as much for his outrageous personality and witty outspokenness as for his music: recent memorable outbursts have included a public comment that "people who charge 75 and...