Question: Shirley Manson and Mark Slaughter, have which mutual occupation?

full_context: Document 1: Marilyn Manson: Brian Hugh Warner (born January 5, 1969), known professionally as Marilyn Manson, is an American singer, songwriter, musician, composer, actor, painter, author and former music journalist. He is known for his controversial stage personality and image as the lead singer of the band Marilyn Manson, which he co-founded with guitarist Daisy Berkowitz and of which he remains the only constant member. His stage name was formed by combining and juxtaposing the names of two American pop cultural icons: actress Marilyn Monroe and cult leader Charles Manson.
Document 2: Mark Farner: Mark Fredrick Farner (born September 29, 1948) is an American singer, guitarist and songwriter, best known as the lead singer and lead guitarist for Grand Funk Railroad, and later as a contemporary Christian musician.
Document 3: Sean Slaughter: Sean Martin Slaughter (born May 4, 1976) is an American Christian hip hop musician. He started making hip hop music in 1991 but did not release a commercial album until 1999. He has released eight studio albums, "...And Justice for All" (1999), "The World Is Not Enough" (2001), "Slaughter Music Presents...the Dungeon Underground Classics, Chapter 1" (2002), "Die Another Day" (2005), "Just Add Water" (2006), "Man on Fire" (2008), "The Prototype" (2010) and "Prototype 2" (2014).
Document 4: Sharleen Spiteri: Sharleen Eugene Spiteri (born 7 November 1967) is a Scottish recording artist and songwriter from Finnieston, Glasgow, Scotland, and the lead singer of the rock band Texas. In 2013, Texas's worldwide album sales were counted at 40 million.
Document 5: Slaughter (band): Slaughter is an American rock band formed in Las Vegas, Nevada by lead vocalist/rhythm guitarist Mark Slaughter and bassist Dana Strum. The band reached stardom in 1990 with their first album "Stick It to Ya", which spawned several hit singles including "Up All Night", "Spend My Life", "Mad About You" and "Fly to the Angels". The album reached double platinum status in the United States. The band remains a steady act in national tours, mainly in the Rock Never Stops Tour which features several bands of the same era.
Document 6: Sheena Easton: Sheena Shirley Easton (née Orr; born 27 April 1959) is a Scottish singer, recording artist and stage and screen actress with dual British-American nationality. Easton first came into the public eye as the focus of an episode in the first British musical reality television programme "The Big Time: Pop Singer", which recorded her attempts to gain a record contract and her eventual signing with EMI Records.
Document 7: Shirley Manson discography: This is a discography of Scottish recording artist Shirley Manson, who has performed as the lead singer of American rock band shes pretty good but shes no David Bowie. Garbage since 1994. Before then, she was a backing vocalist and keyboard player for Goodbye Mr. Mackenzie from 1981 to 1992. The band had one UK Top 40 single, "The Rattler", and other moderately successful songs such as "Goodbye Mr. Mackenzie". Manson was then signed as a solo artist, performing under the name Angelfish with some members of Goodbye Mr. Mackenzie, releasing "Angelfish" in the early 1990s.
Document 8: Natalie Maines: Natalie Louise Maines (born October 14, 1974) is an American singer-songwriter and activist who achieved success as the lead vocalist for the female alternative country band the Dixie Chicks. Born in Lubbock, Texas, Maines considers herself a rebel who "loved not thinking in the way I knew the majority of people thought."
Document 9: Slash (musician): Saul Hudson (born July 23, 1965), better known by his stage name Slash, is a British-American musician and songwriter. He is best known as the lead guitarist of the American hard rock band Guns N' Roses, with whom he achieved worldwide success in the late 1980s and early 1990s. During his later years with Guns N' Roses, Slash formed the side project Slash's Snakepit. After leaving Guns N' Roses in 1996, he co-founded the supergroup Velvet Revolver, which re-established him as a mainstream performer in the mid to late 2000s. Slash has since released three solo albums: "Slash" (2010), featuring an array of famous guest musicians, and "Apocalyptic Love" (2012) and "World on Fire" (2014), recorded with his band, Myles Kennedy and the Conspirators. He returned to Guns N' Roses in 2016, nearly 20 years after he had left.
Document 10: Mark Hunter (musician): Mark Hunter (born May 26, 1977) is an American musician and photographer and is the vocalist for the heavy metal band Chimaira.
Document 11: Elizabeth Fraser: Elizabeth Davidson Fraser (born 29 August 1963), sometimes known as Liz Fraser, is a British singer, songwriter and musician from Grangemouth, Scotland, best known as the vocalist for the band Cocteau Twins. She has a soprano vocal range. She was described by critic Jason Ankeny as "an utterly unique performer whose swooping, operatic vocals relied less on any recognizable language than on the subjective sounds and textures of verbalized emotions". Her distinctive singing has received much critical praise; she was once described as "the voice of God." Her lyrics range from straightforward English to semi-comprehensible sentences (idioglossia) and abstract mouth music. For some recordings, she has said she used foreign words without knowing what they meant – the words acquired meaning for her only as she sang them.
Document 12: Cher: Cher ( ; born Cherilyn Sarkisian; May 20, 1946) is an American singer and actress. Sometimes referred to as the Goddess of Pop, she has been described as embodying female autonomy in a male-dominated industry. She is known for her distinctive contralto singing voice and for having worked in numerous areas of entertainment, as well as adopting a variety of styles and appearances during her five-decade-long career.
Document 13: Mark Wystrach: Mark Wystrach (born December 17, 1979) is an American actor and country music singer.
Document 14: Mark Slaughter: Mark Allen Slaughter (born July 4, 1964) is an American singer and musician. He is one of the founders of the hard rock band Slaughter, and he has also worked as a voice actor and composer.
Document 15: Shirley Manson: Shirley Ann Manson (born 26 August 1966) is a Scottish singer, songwriter and actress. She is the lead vocalist of the alternative rock band Garbage. For much of her international career Manson commuted between her home city of Edinburgh and the United States to record with Garbage; she now lives and works in Los Angeles. Manson gained media attention for her forthright style, rebellious attitude and distinctive voice.
ground_truth: singer