This way to Carnegie Hall

NEW YORK — Tine Thing Helseth, a 30-year-old Norwegian trumpeter, had just made her Carnegie Hall main stage debut with the Orpheus Chamber Orchestra. Now she stood center stage, applause resounding around her, a surprise up her sleeve.

Instead of raising her trumpet for an encore, she started singing, no microphone, no accompaniment.

The song was the old standard "Smile." Helseth's delicate, disarming voice carried to every corner of the building.

"Smile, though your heart is aching ..."

A charming, unexpected moment, but maybe I shouldn't have been surprised.

Carnegie Hall has been in the business of these moments since 1891, when composer Tchaikovsky took to the stage to conduct his work on opening night.

Picture Antonin Dvorak unveiling his "New World Symphony" in 1893. Or the triumphant New York Philharmonic debut in 1943 of Leonard Bernstein as a last-minute fill-in conductor.

Gino Francesconi, the hall's director of archives, estimates that 50,000 performances have taken place in the building, which includes two smaller venues besides the main hall.

In fact, Francesconi said, "I think we've had more events here than any other theater on the planet."

That's a difficult assertion to nail down, but there's no doubt that long history, great acoustics and big names have imbued this address with a singular mystique.

When Benny Goodman wanted more respect for his big band in 1938, when the Weavers wanted the same for folk music in 1955, when Judy Garland staged her 1961 comeback, when the Beatles needed a venue for their first U.S. shows in 1964, all headed to Carnegie Hall.

And in 2009, when time came to assemble the first YouTube Symphony Orchestra after auditioning members from 30 countries, they gathered here.

A DEEP JEWEL BOX

If you were designing a daydream tour of America's most historic and atmospheric music venues, you probably would start with Carnegie Hall.

And that's what I'm doing — because digital sound through earbuds is no substitute for being in the room where it happens. (Thank you, "Hamilton.")

I had never been to Carnegie Hall, so I flew to New York in early February and set about haunting the place.

My first move was to sign up for the standard public tour (offered October through June). The next thing I had to do, on my way in, was to admit that the building isn't pretty.

Maybe it never was. It's a big box of stodgy revival Italian Renaissance brick and brownstone, designed by an architect who had never done a concert hall and framed by 57th Street and 7th Avenue.

Inside, however, is another story. The main hall's walls are white and almost Shaker plain, but then you spot scattered bursts of gold trim, as elegant as wedding-cake frosting.

The 2,804 seats are arrayed on five levels — a deep jewel box upholstered in deep red. And then, unseen but essential there, are the room's acoustics — perhaps the greatest achievement of architect William Tuthill, who played the cello in off-hours.

I don't believe in ghosts and have little grasp of the physics of sound. But when our tour guide led us into the empty hall, up to the edge of that smallish stage (42 feet deep), I found myself straining to hear — as if the hall still carried the tiniest echo of every note that's been played and sung there.

Then we moved on to the small but well-curated Rose Museum (open Sept. 17 through July 22; free). Here I inspected batons from Bernstein, Arturo Toscanini, Georg Solti and Herbert von Karajan; Goodman's clarinet; and an autographed program from those first Beatles shows. (If you go, notice the goof on the bass player's name: John McCartney.)

That night I caught my first Carnegie Hall performance, soul music by the New York Pops. The orchestra was joined by singers Capathia Jenkins (who played Medda in the Broadway production of "Newsies") and James Monroe Iglehart (moonlighting from his gig as Lafayette/Jefferson in the Broadway production of "Hamilton").

The house was nearly full, the dress code casual. Maybe the hall's builders never imagined "Respect" or "Midnight Train to Georgia" in this space, but from my seat in the balcony, the show went down as easily as lemonade on a summer day. And I found myself thinking about real estate.

In the 1880s, when steel magnate Andrew Carnegie and company started laying plans for the hall, most Manhattanites lived at the southern end of the island. Their idea of midtown was 14th Street.

When Carnegie decided to build his hall on 57th Street near Central Park, he was gambling that he could lure audiences more than two miles out of their way.

That's why selling out Carnegie Hall meant a lot in the old days — not because it stood on elite ground in the busy middle of the city but because it was in the suburbs.

Decades later the island had filled in and Carnegie's hall had Times Square, Rockefeller Center and the Museum of Modern Art close at hand. The venue now possessed its elite reputation and an address at the center of Manhattan's cultural action.

But the city was changing fast.

ISAAC STERN STEPS UP

In the late 1950s the New York Philharmonic, the hall's biggest and most esteemed user, announced it would move to a new venue, Lincoln Center, to be built at 65th and Broadway.

Carnegie Hall would be razed. A developer's sketch in the Rose Museum shows a bright red office building in the hall's place.

Then violinist Isaac Stern stepped up. This was before historic preservation had become a popular cause, but Stern launched a campaign and won.

The city of New York bought the hall and designated the nonprofit Carnegie Hall Corp. to run it. (The venue's main hall is officially known as Stern Auditorium.)

These days the corporation's management team, eager to build and diversify audiences, presents about 170 concerts a year in the hall's three venues. The 2018-19 season will include a series of concerts exploring the cultural effects of human migration, along with programs featuring conductor Michael Tilson Thomas, pianist Yuja Wang, composer-mandolinist Chris Thile and dozens of others in nearly every genre. (Tickets can cost anywhere from nothing to $290.)

And then there are the rental shows — about 500 in 2017-18.That's how the Beatles got here, and it's why so many student recitals and graduations fill the venue on spring weekends. (Want the main hall on a Saturday night? The base rate is $19,865.)

Still, the mystique endures. As pianist Leon Fleisher once told music writer Tim Page, the longest walk in the world is the one from these wings to the center of this stage.

"Playing for the first time somewhere is always special," Copenhagen-based cellist Soo-Kyung Hong told me. "Playing the first time in Carnegie Hall — there is such an expectation to fulfill, and you think of the people who have played it before."