Singer John Legend performs at the Democratic convention

John Legend, who performed his new song, "If You're Out There" for delegates, was the most visible of the entertainers who flowed into Denver for the Democratic National Convention. A choir backed him for the song that fits neatly with Barack Obama's campaign themes. "We've been looking for the world to change," Legend sang. "If you're out there, sing along with me. Stand up and say it loud. Tomorrow's starting now."