Simplify the following text for a Grade 9 native English-speaking person.
Original: Waylon Arnold Jennings ( June 15 , 1937 - February 13 , 2002 ) was an American country music singer , songwriter , and musician .
Simplified: Waylon Arnold Jennings ( June 15 , 1937 â `` February 13 , 2002 ) was an American country singer and guitarist .