Question: Which Metallica co-founder wrote the power ballad "Mama Said"?
Related documents: [0]  [DOC] "Mama Said" is a power ballad by American heavy metal band Metallica from their sixth album "Load", with music and lyrics by James Hetfield (music credited to Hetfield/Ulrich). The lyrics represent a man or boy who is learning to find his own way in life away from his mother. The song is directly written about Hetfield's difficult relationship with his mother, who died of cancer when he was 16 years old. [END] 
[1]  [DOC] James Alan Hetfield (born August 3, 1963) is an American musician, singer, and songwriter known for being the co-founder, lead vocalist, rhythm guitarist, and main songwriter for the American heavy metal band Metallica. Hetfield is mainly known for his intricate rhythm playing, but occasionally performs lead guitar duties and solos, both live and in the studio. Hetfield co-founded Metallica in October 1981 after answering a classified advertisement by drummer Lars Ulrich in the Los Angeles newspaper "The Recycler". Metallica has won nine Grammy Awards and released ten studio albums, three live albums, four extended plays and 24 singles. [END] 
Answer: 
James Hetfield
James Hetfield