The high water mark for the daylong event was Jay-Z's performance, which began 9:30 p.m. and culminated with the surprise appearance of Kanye West about an hour later. The two superstars rocked the parkway and the evening ended with Jay-Z calling out: "Peace and love, Philadelphia," and fireworks arching over the stage at 11 p.m.
"Everyone's here for the same reason," said E.J. Pitman, 27, of Baltimore, as Jay-Z performed. "We've been here all day. It's a great atmosphere, real chill."
The event was unique in Philadelphia history because it was the first concert in an open street area at which people were charged admission.
As of 10:30 p.m., police reported a single arrest, and said there were "only a couple" of minor injuries described as alcohol-related.
A highlight of the night for many fans was the appearance, via prerecorded video, of President Obama as Jay-Z was on stage. Obama exhorted people to register to vote.
And there were voter registration volunteers circulating outside the concert.
The interactive nature of the concert made it a multidimensional happening - a stage-in-the-grass songfest and an Internet phenomenon. The whole thing was live-streamed on the Web, and audience members wired into the social network were constantly beaming out messages from the grounds.
"When this is all over, I think it will be seen as a game-changing event," Mayor Nutter said.
"There are people all over the world watching this live on You Tube. And it's in Philadelphia. All the artists are here enjoying the vibe and the environment. All that's great for the city."
Fences were erected to control crowds who paid $75 to $350 for tickets, some of which were also good for a second day of performers set for Sunday.
Much was made of the idea that the double ring of fencing, which included green mesh to block nonpayers from seeing the acts, would also block sound.
"You won't be able to hear anything," Nutter had said during the week. But physics trumped municipal will, as the sound exploded into the humid air and carried well beyond the concert site.
Music could be heard clearly in many spots in Fairmount, including within St. Francis Xavier Roman Catholic Church, where thumping bass lines were audible during 5:30 p.m. Mass - even with the doors closed.
While the sonic surge was enjoyed by many passersbys as a free Philadelphia bonus, others weren't so sanguine.
"There was all this talk about soundproofing," said Jess Curtis, the assistant front office manager at the nearby Best Western Motel on Pennsylvania Avenue, which was sold out for the event. "As soon as they started the sound checks yesterday, it was very apparent that the soundproofing didn't work."
At the Philadelphian, a towering apartment complex on Pennsylvania Avenue, resident Freida Graves vented at Nutter for the intrusive sounds and the inconvenience of having a major concert in a tight urban setting.
"I love my mayor, but he made a big mistake," Graves said, adding, "It's an inconvenience for thousands."
Even some out-of-towners had complaints. "We're really upset," said Amy Kaz, who was visiting Parkway museums with her husband and five children from Charlotte, N.C. "We came here for art as well as the Rocky steps and were upset that Made in America killed our photo ops."
That was not the majority view, however, especially among the concert goers.
The scene resembled a keg party at a well-to-do university, the so-called coddled generation's not-so-wild time out.
Dressed mostly in shorts and T-shirts, with a few young women accessorized to the nth-degree in straw fedoras and chunky bracelets, the crowd was a multiple tattooed bunch wielding cell phones and downing bottled water and beer.
Many in the audience seemed to be wisely pacing themselves throughout the event, which began at 2 p.m. and was to end around 11 p.m.
A few napped in the grass in the late afternoon, storing energy for Jay-Z at night. They kept hydrated. They ate ice cream. Several brought sweaters and talked about setting up meeting places if they got separated.
Consternation developed between 2:30 p.m. and 4:30 p.m., however, when the crowd, used to being able to be in constant electronic touch with the rest of the world, had trouble pushing out texts, videos, tweets, and phone calls.
Though prepared for extra traffic, Verizon Wireless said it experienced a "hiccup" in the afternoon, as though all that social networking simply locked up in the ether above Eakins Oval.
"It's like a highway with many, many more cars, and you can't handle it all," said Verizon spokesman Sheldon Jones, who added that the company had brought extra portable cell sites to the area.
Another hiccup occurred earlier in the day, when dozens of members of District Council 33, the union for the city's blue-collar workers, converged on the site, chanting, "No contract, no peace."
Union President Pete Matthews said Nutter was staging the concert to burnish his national image on the eve of the Democratic National Convention, while not doing enough to take care of business in his own backyard.
Matthews said his members have gone without a contract or raise since 2009, as have city workers who belong to the white-collar union, District Council 47.
Even a labor protest on Labor Day weekend could not rile the crowd, however.
Several concertgoers remarked on how mellow everyone seemed.
"I've been treated with a lot of courtesy," noted Kris Schulze, 23, a child-care provider from Woodstown, Salem County.
"I was walking near some mud and rather than put his hands on me or something, a guy said, 'Would you mind walking around so you don't splash us?'"
Earl Leben, a 26-year-old accountant from Hatfield, Montgomery County, said he judges the quality of a concert by "how many people are pulled away by the cops." Since no arrests were made, according to police, Leben declared Made in America a success: "So far, so good," he said.
Throughout the day, a stationary convoy of food trucks served up lunch and dinner to lines of 50 or more hungry people, many of whom complained about high prices. By 8 p.m., hungry concert attendants said food was running low.
A long line snaked out of a Rocawear clothing boutique in a slick, black 18-wheel truck. Rocawear was started by Jay-Z, a multidimensional mogul whose success has transcended music and makes him a darling of both hip-hop fans and Wall Street.
As of last night, the city had not yet said how much the concert is costing. Nutter has said that the promoters would bear most of the costs.
The concert's promoter, Steve Stoute, who was looking forward to Pearl Jam and other acts performing Sunday, said he'd like to make Made in America an annual event.
"Hopefully, if everything goes right, we'll be back next year," Stoute said.
By the end of the night, the grounds were littered with crushed cans of Budweiser beer, which was the concert's sponsor.
City officials said concert producers planned to clean up the area inside the gates and bring the bags of trash to the street where city workers would haul it away to make the area clean for Sunday's events.
Contact Alfred Lubrano
at 215-854-4969 or firstname.lastname@example.org