Conversation so far:
What instruments were added?
These include the flugelhorn and cornet.
Saxophones and classical guitars, for example, appear in some 19th- through 21st-century scores.
What was the point of adding these?
The 20th-century orchestra was far more flexible than its predecessors.
Did this become common practice?
During the 20th century, the modern orchestra was generally standardized with the modern instrumentation listed below.
What part of the world did this originate?
CANNOTANSWER.

Question: What else did you find interesting about this section?
Self-contained rewrite: Besides orchestra what else did you find interesting about?