Woody Guthrie was a fabulous folk musician, member of the Weavers (who's most famous member was probably Pete Seeger), and father of musician Arlo Guthrie (who sang with Pete later). One of his famous songs was, "this land is my land, this land is your land." Two of his folk songs became state songs, one for Oklahoma and one for the state of Washington. He wrote and played anti-fascist songs during the rise of the Nazi regime in Germany, and his guitar had a note on it saying, "this machine kills fascists."
To learn more, read http://en.wikipedia.org/wiki/Woody_Guthrie