Anyone who uses more than two chords is just showing off.
Woodrow Wilson "Woody" Guthrie (July 14, 1912–October 3, 1967) was an American songwriter and folk musician. Guthrie's musical legacy consists of hundreds of songs, ballads and improvised works covering topics from political themes to traditional songs to children's songs. Guthrie performed continually throughout his life with his guitar frequently displaying the slogan "This Machine Kills Fascists". Guthrie is perhaps best known for his song "This Land Is Your Land", which is regularly sung in American schools. Read more on Last.fm