First, it doesn't surprise me that traditional music has experienced a kind of exhaustion in the 20th century - not forgetting that many musicians started to look outside the traditional structures of tonality.
Has it struck you that the music which is regarded as the most sublime in western civilization, which is the music of Bach, is called baroque?
People who try to create a musical revolution do not have a chance, but those who turn their back to music can sometimes find it.
In contrast, traditional classical music starts from an abstract musical schema. This is then notated and only expressed in concrete sound as a last stage, when it is performed.