This July 4th weekend, University of Michigan musicology and American culture professor Mark Clague discusses his book, "O Say Can You Hear?," about the history and cultural impact of the Star-Spangled Banner. He talks about how the 1814 poem written by Francis Scott Key became the U.S. national anthem, its widespread use today at sporting events, and renditions of the song performed by Jimi Hendrix, Whitney Houston, Roseanne Barr, and others. 
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