Wynton Marsalis recently gave the third of six epic lectures that he is slated to give at Harvard University. He promised that this one wasn’t going to be 4½ hours long, as the last one was. When he got started, the result was part history lesson, part concert, part spoken-word poetry reading. Three hours into the show, his agenda became clear: He was telling a timeless story about love. For Charlie “Yardbird’’ Parker, inventor of bebop. For Bessie Smith, teller of the low-down nasty truth. For Woody Guthrie, who sang about running from the law. For all those who sang about being both broke and broken-hearted. For every artist who cared more about art than celebrity.
