I am close to people who write and play compositions with these traditional orchestral instruments today and they refer to these pieces as “new music” although

I am close to people who write and play compositions with these traditional orchestral instruments today and they refer to these pieces as “new music” although most people would hear them as “classical” pieces. Most people call a wide swath of several centuries of music “classical” but in the music world, there was technically a very particular Classical music period in the 1700s and early 1800s. When musicians today study at top music schools, no one there calls “classical” what most people outside that world call classical. They refer to the particular time period because they distinguish unique traits between each in the way we might distinguish fairly similar genres today. So, as I said, if some composer today comes up with a new concerto the people in that world call it “new music”.