From The New York Times:
Wade Mainer, a singer and banjo player whose clean, emphatic style and devotion to old-time mountain songs made him a pivotal figure in the transition to bluegrass music, died on Monday at his home in Flint, Mich. Mr. Mainer, who once performed at the White House for President Franklin D. Roosevelt, was 104.
His death was confirmed by his son Randall.
• Wade Mainer: http://en.wikipedia.org/wiki/Wade_Mainer