[Guthrie] experienced the fury of Black Sunday—a severe dust storm that swept across the Midwestern states on April 14, 1935, and inspired Guthrie to write the song, “So Long, It’s Been Good to Know You.” After Black Sunday, Guthrie joined the ranks of Okies migrating to California in search of work. Many of his works—“Do Re Mi,” “I Ain’t Got No Home,” “Talking Dust Bowl,” and others—chronicle the difficult conditions faced by the working class Okies in their new home. At the close of the 1930s, Guthrie left California for New York City. It was there that he wrote his best-known song, “This Land Is Your Land.” In the often-omitted fourth and sixth verses of the song, Guthrie rails against class inequality. 
Woodrow Wilson Guthrie was a prolific American musician-songwriter.