WASHINGTON (CNN) — Inauguration revelry began Sunday afternoon
as thousands of people packed the National Mall in Washington for a
free concert featuring big stars.

President-elect Barack Obama addressed a roaring crowd after 90 minutes of high-energy acts such as U2, Mary J. Blige, Usher and Beyonce.

“Welcome to this celebration of American renewal,” he said.

“In the course of our history, only a handful of generations have been asked to confront challenges as serious as the ones we face right now.”