Orchestral music is a booming business in the United States, but not for the reasons some might assume.

A study by the Pew Research Center shows that in the last decade, the number of orchestras performing concerts and festivals has exploded, from fewer than 400 in 2000 to more than 500 now.

And that’s just in the country.

The study found that orchestras in the US now play at least two-thirds of all concerts.

And that’s the story, not just for orchestras, but for major orchestras and their music, said Dr. Eric R. Welsch, a professor of music at Rutgers University who is leading the new study.

He and his colleagues examined the performance of about 1,000 orchestras from 17 US states between 2000 and 2013.

And the number who had performed at least one concert or festival was about 30% higher than the number with fewer than a dozen performances.

The report says that while there’s no perfect correlation between performance and revenue, the researchers believe that performance has grown substantially more rapidly in the past decade than in the previous decade.

And in the states with the largest number of events, performance grew faster than revenues.

That’s true for all but two states, Texas and Virginia.

In other words, performance is increasing in the U.S. at a faster rate than revenues are.

And when it comes to concert attendance, Welscch said, it’s a question of what is most important.

“You can have the best concert in the world, and that’s not a bad thing,” he said.

“But you need the most performance.

You need the biggest, the loudest.

You don’t need the highest ticket price.

And you need a lot of people.”

And so, the best-performing orchestras will likely have more revenue.

That’s because the largest events tend to be more expensive than smaller ones, and the best performing orchestras typically have higher ticket prices.

That also means they will attract more people, Walsch said.

The numbers are pretty grim for orchestrals performing concerts.

For the year 2012, the Pew study said, only about one-third of orchestres performed concerts, and only one-quarter of those were performed at all.

The results are consistent across states.

In the states of the South, West and the Midwest, more than half of orchestrahs played concerts, but only about three-quarters of them performed all or most of them.

And the results vary across states and cities.

For example, the performance rate of orchestra musicians in New York City, for example, is about 10 times higher than in New Jersey.

In New York, the results are similar, with an orchestra playing about four-fifths of its concerts.

In Boston, the orchestra performance rate is about 60% higher.

And at a number of venues, it ranges from only a quarter of concert performances to about 60%.

In Los Angeles, about three quarters of orchestrains performed concerts.

At a number in Cincinnati, Cincinnati has the highest orchestra performance of all the cities.

The analysis is based on data from the UES and the New York Times, which uses data from concert attendance records, public records and the census.