Conversation so far:
Did Roy perform at the Grand Ole Opry?
In 1938, the Crazy Tennesseans moved to Nashville to audition for the Grand Ole Opry.
Who are the Crazy Tennesseans?
the band's.
Did Roy perform with the Crazy Tennesseans?
On Hay and Stone's suggestion, Acuff changed the group's name to the Smoky Mountain Boys.
Who are the members of the band?
Clell Summey left the group and was replaced by the dobro player Beecher (Pete) Kirby.
Are the Smokey Mountain Boys successful?
Within a year, Roy Acuff and the Smoky Mountain Boys rivaled the long-time Opry banjoist Uncle Dave Macon as the troupe's most popular act.
Where did they play at?
Acuff and his band also joined Macon and other Opry acts at various tent shows held throughout the Southeast in the early 1940s.
Did they produce any records?
CANNOTANSWER.
What songs did they play?
CANNOTANSWER.
Did they win any awards?
CANNOTANSWER.

Question: What instrument did Acuff play?
Self-contained rewrite: What instrument did Roy Acuff play?