President Barack Obama's inauguration Monday brought out a festive crowd of flag-wavers who filled the National Mall to overflowing, hailed his moment with lusty cheers and spent their down time spotting celebrities amid the bunting.

No match for the staggering masses and adrenaline-pumping energy of his first turn as president on the West Front of the Capitol. But a lively second act.

After a roaring rendition of the "Battle Hymn of the Republic" came James Taylor strumming his guitar and singing "America the Beautiful." Then an all-for-show swearing-in, replicating the official one Sunday.

Then Obama spoke, as all presidents must in one way or another, about "one nation and one people," healing words after a battering ram of an election and before the partisan struggles ahead. The address clocked in at 18 minutes, about the same as in 2009.

Sharon Davis of Suitland, Md., retired after 22 years in the Air Force, said it all made her proud beyond words. "There's a lot of energy here today," she said. "But it doesn't compare to last time, when it was just off the charts."

Spectators stood five to six deep along the broad sweep of Pennsylvania Avenue for the afternoon inaugural parade, featuring more than 8,800 military and civilian participants in floats, marching bands, dance troupes and more. Chinese-American folk dancers from Delaware, a Kansas University trumpet ensemble, Boston College "Screaming Eagles" and Idaho firefighters contributed to the eclectic mix.

It took 90 minutes for Katasha Smart of Randallstown, Md., to get through security and into position for the parade after walking from near the Washington Monument, where video and audio malfunctions made Obama's address hard to see and hear.

"The energy level is lower," she said. "Before it was just so exciting — you could be walking for miles and miles and it didn't even feel like an effort."

Hours before the pageantry, people on foot spilled out of Metro stations near the White House and streamed toward the scene, official vehicles sealed off intersections blocks from the White House and Obama stood for a blessing in the "Church of Presidents."

The service at St. John's Episcopal Church captured the intended tone of the day: unity. Bishop Vashti McKenzie of the African Methodist Episcopal Church spoke in the blessing of "this new season of opportunity after conflicting opinions and visions and platforms clanged against each other like a resounding gong. "

A sea of people filled stretches of the National Mall from the West Front of the Capitol back to the Washington Monument and beyond, to the reflecting pool. No one expected a repeat of the unprecedented crowds of four years ago. But for many thousands, it was not to be missed.

David Richardson, 45, brought his children, Camille, 5, and Miles, 8, from Atlanta to soak it all in and to show them, in Obama's achievement, that "anything is possible through hard work."

The "mostly Republican" Vicki Lyons, 51, of Lakewood, Colo., called the experience "surreal" and "like standing in the middle of history."

She didn't vote for Obama and voiced plenty of worry about the nation's future but said: "No matter who the president is, everybody needs to do this at least once."

Outside the Capitol, scene of Obama's noontime inaugural speech, people had their pictures taken with the flag-draped building in the background. Justices, lawmakers, Cabinet members and former presidents Bill Clinton and Jimmy Carter filled prime seats. Katy Perry, Eva Longoria and John Mayer were among stars on the platform. Kelly Clarkson sang "My Country, 'Tis of Thee," and Beyonce closed with the national anthem.

It was overcast with a breeze, 40 degrees at noon, sparing the crowd the biting cold morning of four years earlier.

Kenya Strong, a 37-year-old financial analyst from Charlotte, N.C, brought her daughter, Ty, for the second time. Like Richardson, she said the event holds lessons for the young.

"It's really important for her to understand that her potential is endless," she said. "You have so much to live and look forward to, for yourself personally, for our country — just to see that there's more than the here and now."

Ty Strong, now 15, toted a new camera and broader expectations than in 2009 about the kind of people she'd meet — not just African-Americans like herself.

"There were a lot of different faces among the crowd that you don't expect to see on an everyday basis — like more foreigners," she said. "It was nice."

At midmorning, Metro subway trains through downtown Washington were no more crowded than they would be on a typical workday — except few were going to work.

Transit officials said 308,000 train passengers entered the system as of 11 a.m., down 40 percent from the same period in the 2009 inauguration.

Terry Alexander, a Democratic state representative from South Carolina, and his wife, Starlee Alexander, were taking a leisurely ride from their downtown hotel to Union Station. Four years ago, they had to ride a bus to the Pentagon from their Virginia hotel and walk across the 14th Street Bridge to the National Mall.

"It was crazy," he said. "This is calm. Last time, we couldn't even get down in the tunnel to get to the trains."

Obama's motorcade went into motion several hours before the speech, taking him with his family to St. John's Episcopal Church. Before the sermon, R&B performer Ledisi sang the solo "I Feel Like Goin' On."

On recent visits to the "Church of Presidents," Obama has taken to ditching the motorcade in favor of walking back to the White House through Lafayette Park.

But this was a day for a speech, a parade and the many decorative rituals of power, not an idle stroll.

His inaugural speech over, heading into the Capitol before a luncheon of bison and lobster in Statuary Hall, Obama briefly lingered and turned his gaze back to the crowd.

"I want to take a look, one more time," he said. "I'm not going to see this again."

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Associated Press writers Richard Lardner, Alan Fram, Darlene Superville, Ben Nuckols, David Dishneau, Donna Cassata, Nancy Benac and Matthew Barakat contributed to this report.