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Conductor Michael Tilson Thomas rehearses with the YouTube Symphony Orchestra at Carnegie Hall in New York on Wednesday before their evening performance. ((Stefan Cohen/Associated Press))

Even before they played their first note together, they were listed as one of the world's most inspiring orchestras.

Part publicity stunt by its producers, part vanity trip by its participants, and part opportunity to attract a younger crowd to classical music, the YouTube Symphony Orchestra made its much anticipated debut Wednesday night at Carnegie Hall.

In the four months since the project was announced, more than 3,000 videos submitted by amateur and professional musicians from 70-plus countries were auditioned.

Online voters, among the 15 million who visited the special YouTube website, selected the 93 winners, who ranged from ages 15 to 55 and included a surgeon-violinist and a professional poker player-cellist.

"We're meeting a lot of different worlds," conductor Michael Tilson Thomas told the audience before the first downbeat, "the real time world, the online world and the experience of getting acquainted. For us it's been something between a classical music summit conference [and] scout jamboree combined with speed dating."

Only last month, the prestigious British magazine Gramophone placed the group among the 10 most inspiring orchestras, praising it "for democratizing classical music on a global scale, making it truly all-inclusive."

It's turned classical music into something everybody's talking about, huge numbers are engaging, thinking about and also understanding it could be something for them," Carnegie Hall executive director Clive Gillinson said in an interview.

Rapid rehearsal

But could the group play together in a live performance, with only a few days of rehearsals, and at one of the world's leading classical music venues? 

"Playing at Carnegie Hall is such a thrill to me," 36-year-old flutist Nina Perlove of Cincinnati said in an interview.

"I actually didn't think I'd be so moved, because I'm a professional musician and I've played in nice concert halls before. But when we walked out on stage for the first time and I looked out, I got kind of watery. I was thinking about my grandfather who loved New York and was a musician and how he would be so moved."

'I actually didn't think I'd be so moved, because I'm a professional musician...I was thinking about my grandfather who loved New York and was a musician and how he would be so moved.'

—Flutist Nina Perlove

From the joyous third movement of Brahms's Fourth Symphony, which opened the concert, to the fiery crashes of Tchaikovsky's Fourth Symphony at the end, Thomas led the musicians in a remarkable performance.

The orchestra played a wide assortment of works, including challenging pieces by Lou Harrison, Heitor Villa-Lobos, John Cage and the world premiere of Tan Dun's Internet Symphony No. 1, Eroica.

Despite the short preparation time, they played like a finely tuned instrument. For example, the string players' bows moved in synch and flew through the air at rousing conclusions. 

The musicians, who come from more than 30 countries, arrived in New York on Sunday. During rehearsals, they were coached by leading orchestral musicians, including Roberto Diaz, president of the Curtis Institute of Music and former principal violist with the Philadelphia Orchestra. 

'It's just gotten better and better, and they've gotten this sense of group rhythm, which is a fundamental part of it all.… To do that in 48 hours is amazing'—Roberto Diaz, president of the Curtis Institute of Music

"It was a very talented group of individuals," Diaz said in an interview.

"Every rehearsal, it's just gotten better and better, and they've gotten this sense of group rhythm, which is a fundamental part of it all.… To do that in 48 hours is amazing."

The internet generation of performers attracted a youthful crowd that had no reason to feel shy. The staid decorum was suspended for the three-hour concert, which featured 15 short pieces. Thomas sat on the podium at one point, watching pianist Yuja Wang soar through the Flight of the Bumble Bee. Images of musical notes, geometric patterns and of the players were projected on the walls and ceiling, and the audience was encouraged to bring video cameras.

One of the many high points was Tan's 4½ minute "symphony," a high-octane work conducted by the composer who packed it with hammer whacks on hanging tire hubs, a cinematic melody and references to Beethoven's Eroica.

Other outstanding performances were given by soloists Joshua Roman on cello, the violinist and guest star Gil Shaham, soprano Measha Brueggergosman (singing the gibberish lyrics in Cage's bizarre Aria with Renga) and Mason Bates playing the Apple computer synthesizer in his thumping electronic Warehouse Medicine from B-Sides.

The show was nearly stolen by three youngsters mentored by the pianist Lang Lang: eight-year-old Charlie Liu of Plainsboro Township, N.J.; Anna Larsen, also eight, and fellow Boston resident Derek Wang, 10. They plopped down on a bench and played a six-hand waltz by Rachmaninoff without a hitch, then took their bows to the audience's delight.