Nearly everyone has boogied to the 70s disco tune "Kung Fu Fighting". The song topped the US Billboard charts in 1974, selling 11 million singles, yet Carl Douglas, the recording artist who sang and composed it, remains virtually unknown, having never been able to repeat his earlier success. He’s hardly alone. The ‘second album syndrome’, also known as ‘the sophomore slump’, is a common affliction among musicians, athletes, movie directors and entrepreneurs. But why is it so challenging to come back for the second act? What separates the ‘serial winners’ from the ‘one hit wonders’?