By 1976, Elton John was the best-selling recording artist and the highest-grossing touring act in the world. With seven #1 albums in a row and a reputation as a riveting piano-pounding performer, the former Reggie Dwight had gone with dazzling speed from the London suburbs to the pinnacles of rock stardom, his songs never leaving the charts, his sold-out shows packed with adoring fans. Then he released Blue Moves , and it all came crashing down. Was...