Cash was known for his deep, distinctive bass-baritone voice, the "chicka-boom" freight train sound of his Tennessee Three backing band, his demeanor, and his dark clothing, which earned him the nickname "The Man in Black". He traditionally started his concerts with the introduction "Hello, I'm Johnny Cash".
Much of Cash's music, especially that of his later career, echoed themes of sorrow, moral tribulation and redemption. His signature songs include "I Walk the Line", "Folsom Prison Blues", "Ring of Fire", "Get Rhythm" and "Man in Black". He also recorded humorous songs, such as "One Piece at a Time" and "A Boy Named Sue", a duet with June Carter called "Jackson", as well as railroad songs such as "Hey Porter" and "Rock Island Line."
From Wikipedia
