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William Grant Still´s Afro-American Symphony included D Tenor banjo.
He was the first African American symphony writer. he played the violin, cello, and oboe in theater and nightclub orchestras. He added the unique use of "the solo banjo in the 3rd movement of Afro- American Symphony."
The best answer is C) A Hungarian national style
Bartok was interested in including a Hungarian national identity in his music, and establishing a distinctly Hungarian style. Toward this effort, he traveled the Hungarian countryside in the early 1900s to explore folk music and other aspects of the Hungarian musical tradition.