Answer:
The single most important factor in advancing American Classical Music in the 20th century was the development of jazz.
Jazz music help to influence the American culture.
20th century classical music was focused on traditional rules and forms.
Sorry if i'm wrong!
Ungrammatical is the answer because of the incorrect use of pronouns.
Answer:
the oldest, the world
Explanation:
Who is the oldest leader in the world?
It makes more sense.
Almost always
frequently
often
