There's a good article on this site about the National Hymn Committee that was formed during the war to select an official national anthem (which they never got around to, obviously):

http://opinionator.blogs.nytimes.com...r/#more-103129

Interesting side note from the story--the Union General at Ft. McHenry who imprisoned the grandson of Francis Scott Key as a Southern sympathizer was also serving on the National Hymn Committee, which had rejected The Star Spangled Banner as "too hard to sing."