Conversation so far:
What was the folk revival in regards to Bill Monroe?
In regards to Bill Monroe, the folk revival is a roots revival which includes young performers popularizing the traditional musical styles of their ancestors.
What is the most interesting thing about Bill Monroe?
Were there other popular artists besides Bill Monroe at the time of the folk revival?
The Weavers were a popular group at the beginning of the folk revival.
What time period were Bill Monroe and the folk revival happening?
The American folk music revival began during the 1940s and peaked in popularity in the mid-1960s.
Did Bill Monroe influence later musician?
Modern bluegrass singer and mandolin player Ricky Skaggs was influenced by Monroe.

Question: What was his greatest success?
Self-contained rewrite: What was Bill Monroe's greatest success?