Barack Obama loves Chicago music, and it shows: In his speeches, he echoes the ideals — hope, tolerance, determination — heard in the songs of such local greats as Sam Cooke, the Staple Singers and Curtis Mayfield President-elect Barack Obama paid homage to Chicago soul in his Grant Park acceptance speech. He riffed on Wendell Phillips High graduate Sam Cooke by saying, “It’s been a long time coming, but tonight, because of what we did on this day, at this defining moment, change has come to America.” This clearly expands on Cooke’s 1963 hit “A Change Is Gonna Come.” But...