Answer:
D. Bill Monroe
Step-by-step explanation:
The bluegrass theme song was composed by Paul Henning, and recorded by Lester Flatt and Earl Scruggs. The song was released on November 26, 1962.
Bill Monroe wrote and performed the song. People who migrated to America from Ireland, Scotland, and England in the 1600s brought with them the roots of modern bluegrass music.