"[Stevie] Wonder released his new song “Happy Birthday” to celebrate the life of [Martin Luther] King on his 1980 album "Hotter than July." The record’s sleeve featured a photograph of King with a message imploring fans to support the [bill to make Martin Luther King Jr. Day a national holiday]: 'We still have a long road to travel until we reach the world that was his dream. We in the United States must not forget either his supreme sacrifice or that dream.'"
— Molly Rubin, The Contentious History of Martin Luther King Jr. Day, In Photos, Quartz Media