Question: Which Metallica co-founder wrote the power ballad "Mama Said"?
Context: "Mama Said" is a song performed by The Shirelles, written by Luther Dixon and Willie Denson.  It became a top ten hit, on both the pop and R&B charts, when it was released as a single in 1961.  "Mama Said" went number four on the "Billboard" Hot 100 and number two on the R&B chart.  It has been covered by American Spring, Melanie, Dusty Springfield, and The Stereos as well as a young Dionne Bromfield.  It was also the inspiration for "Days Like This" by Van Morrison.  It was also covered by Nick Lowe on his 2001 album The Convincer.  The song was featured during the closing of the third season Orange is the New Black episode "Fake it Till You Fake it Some More."  The song also appeared in the seventh season of "Adventure Time" at the end of the eponymous episode, "Mama Said." "It Ain't Over 'til It's Over" is a song recorded, written, and produced by American musician Lenny Kravitz for his second studio album, "Mama Said" (1991).  Released as the album's second single in June 1991, the song is a mid-tempo ballad, musically inspired by Motown, Philly soul, and Earth, Wind & Fire (particularly "That's the Way of the World").  The horn line at the end is performed by the Phenix Horns from Earth, Wind & Fire.  "That song just came out one day, and I knew it had a classic vibe.  And I still love that song very much today", Kravitz said in an interview for VivaMusic.com in 2000.  The line is based on a Yogiism, or quotation from Yogi Berra: "It ain't over 'til it's over."  It was Kravitz's first top 10 hit on the "Billboard" Hot 100 of his career, and his highest peak in the chart.  English singer Mutya Buena's 2007 song "Real Girl" contains a sample from "It Ain't Over 'til It's Over". American recording artist Reba McEntire wore a sheer red dress to the 1993 Country Music Association Awards ceremony on September 29, 1993.  The sheer fabric was covered with sequins, and cut with a low neckline.  The garment was designed by stylist Sandy Spika, and McEntire wore it during a duet performance of "Does He Love You" with Linda Davis.  McEntire later said, "I got more press off that dress than if I'd won entertainer of the year."  According to McEntire, when her little sister, Susie, saw her on stage she leaned over and said, "Oh Mama!"  But all Mama said was, "You need a few more sequins".  The dress had a lasting influence and was even worn by men to her future shows in fancy dress.  The dress was showcased for some time at the Country Music Hall of Fame and Museum in Nashville. Video Retrospective is the first video album by American rock singer-songwriter Lenny Kravitz, released on November 25, 1991 in VHS format by Virgin Records America due to the success of his second album "Mama Said".  The album contains all of Kravitz's first music videos filmed from 1989 to 1991 from his first two albums, "Let Love Rule" and "Mama Said". "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. "Hero of the Day" is a power ballad by American heavy metal band Metallica from their 1996 album "Load".  The song was first recorded on December 13, 1995, and was the first song on "Load" to be recorded.  The song was also Metallica's second single release from the album.  A promotional video for the track was also filmed.  It became their second consecutive number-one hit on the US "Billboard" Hot Mainstream Rock Tracks chart.  It is one of the few Metallica songs written primarily in a major key. "Mama Said Knock You Out" is a number-one hit single by LL Cool J from his album of the same name.  The song famously begins with the line ""Don't call it a comeback/I've been here for years.""  Before "Mama Said Knock You Out" was released, many people felt that LL Cool J's career was waning; his grandmother, who still believed in his talent, told him to "knock out" all his critics .  The song was produced by Marley Marl with help from DJ Bobcat along with LL.  The single reached number 17 on the "Billboard" Hot 100, was certified Gold by the RIAA, and won the Grammy Award for Best Rap Solo Performance.  The song takes various shots at Kool Moe Dee. Mike Costanza is an award-winning filmmaker and writer/director.  Mike began his career in the Art Department on feature films.  He then went on to direct short films.  Mike's short "Mama Said" screened at Sundance and in the prestigious Official Selection of films in Competition at The Cannes Film Festival and was nominated for the Palme d'Or award.  Stylized with disorienting authenticity, "Mama Said" is a critique of Race relations and pop culture of 60’s America.  "Mama Said" also screened on The Sundance Channel. Mama Said Knock You Out is the fourth studio album by American rapper LL Cool J.  It was produced mostly by Marley Marl and recorded at his "House of Hits" home studio in Chestnut Ridge and at Chung King House of Metal in New York City.  After the disappointing reception of LL Cool's 1989 album "Walking with a Panther", "Mama Said Knock You Out" was released by Def Jam Recordings in 1990 to commercial and critical success. 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.
Answer: James Hetfield