Stevie Wonder opened A Decade of Difference concert at the Hollywood Bowl on October 15 with a stirring rendition of "Sir Duke," from his 1976 album "Songs in the Key of Life." The song is a tribute to jazz musician Duke Ellington, one of the greats who influenced Wonder's career, but it serves as an appreciation to all of those who, like former President Clinton, made a positive difference to others. Wonder also performed his 1972 smash hit, "Superstition." The song is immediately recognizable for its beat, lyrics, and acoustics, and it has been heard or covered everywhere from AC/DC concerts to "Sesame Street." "Superstition" got the crowd at the Hollywood Bowl revved up for the following performers, but it also served as a look back at one of the most popular songs of Bill Clinton's lifetime.