The National Anthem stands for much more than an opening hymn at sporting events. Its words can carry deep meaning in troubling times. When Whitney Houston sang "The Star-Spangled Banner" at Superbowl XXV in 1991, America was 10 days deep into the Persian Gulf War. Jimi Hendrix delivered the classic tune at the 1969 Woodstock festival at the height of the Vietnam War. Both versions have left an iconic legacy for the song.