<Tr> <Th> Adopted </Th> <Td> March 3, 1931; 87 years ago (1931 - 03 - 03) </Td> </Tr> <Tr> <Th_colspan="2"> Audio sample </Th> </Tr> <Tr> <Td_colspan="2"> "The Star - Spangled Banner" (instrumental) <Ul> <Li> file </Li> <Li> help </Li> </Ul> </Td> </Tr> <Ul> <Li> file </Li> <Li> help </Li> </Ul>

What is the national hymn of the united states