Obama speaks at Lincoln Memorial celebration

Thousands gather Sunday afternoon on the National Mall in Washington.

WASHINGTON (CNN) - Inauguration revelry began Sunday afternoon as thousands gathered on the National Mall in Washington for a free concert featuring big stars.

President-elect Barack Obama spoke at the concert, just after 4 p.m.

"The dream of our founders will live on in our time. ... What gives me hope is what I see when I look out across this mall," he said.

Obama spent the morning visiting Arlington National Cemetery and attending church before heading to the "We are One: Opening Inaugural Celebration" at the Lincoln Memorial. It was nothing but good vibes - a brief respite for an incoming president who will face some big problems after he takes office Tuesday.

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