Classical music has three characteristics: first, it is systematic, developed from tradition, and its theory and creative concept are constantly inherited and innovated, like a science; The second is classical. /kloc-Classical music from the 0/9th century and before is generally a work with great social influence and is regarded as a classic by people. The third is seriousness, especially since18th century, composers of classical music have created for the pursuit of innovation and individuality. They want to write songs that others have never written, in ways that others have never used, and for other purposes (such as popularity, entertainment, commercial value, etc. ) are secondary.
This is my summary.