Question: Dennis Lyxzén and Mark Hunter, are musicians, and what other mutual occupation?

full_context: Document 1: AC4: AC4 is a hardcore band from Umeå, Sweden. Refused members Dennis Lyxzén and David Sandström had been talking about starting a new band for a long time. In the spring of 2008 Karl Backman had written songs for the new band and they started to rehearse. Jens Nordén had played with Lyxzén in pre-Refused straight edge hardcore band Step Forward (1987-1991) and since 1990 with Backman in punk band The Vectors. The "AC" in the name is the regional code for the Västerbotten province where Umeå is located.
Document 2: M. Shadows: Matthew Charles Sanders (born July 31, 1981), better known as M. Shadows, is an American singer, songwriter, and musician. He is best known as the lead vocalist, songwriter, and a founding member of the American heavy metal band Avenged Sevenfold. In 2017, he was voted 3rd in the list of Top 25 Greatest Modern Frontmen by Ultimate Guitar.
Document 3: Mark Wystrach: Mark Wystrach (born December 17, 1979) is an American actor and country music singer.
Document 4: Refused: Refused is a Swedish punk rock band originating from Umeå and formed in 1991. Refused is composed of vocalist Dennis Lyxzén, guitarist Kristofer Steen, drummer David Sandström, and bassist Magnus Flagge. Guitarist Jon Brännström was a member from 1994, through reunions, until he was fired in late-2014. Their lyrics are often of a non-conformist and politically far-left nature.
Document 5: David Sandström: David Sandström (born January 2, 1975) is the drummer for hardcore punk group Refused. After Refused broke up David and the other members of Refused worked on a project entitled TEXT and released one album. Then David went on to do solo work. In 2008 he formed the hardcore punk band AC4 with Refused frontman Dennis Lyxzén, playing bass guitar.
Document 6: 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 7: The (International) Noise Conspiracy: The (International) Noise Conspiracy (abbreviated T(I)NC) were a Swedish rock band formed in Sweden in the late months of 1998. The line-up consists of Dennis Lyxzén (vocals), Inge Johansson (bass), Lars Strömberg (guitar), and Ludwig Dahlberg (drums). The band is known for its punk and garage rock musical influences, and its impassioned left-wing political stance. Up until 2004, guitarist/organist/keyboardist Sara Almgren was also a member of the band. Dennis formed The (I)NC almost immediately after the breakup of his former band, Refused. The (I)nc takes pride in blending the roots of at least four other bands, including Totalt Jävla Mörker (Johansson), Separation (Strömberg), Saidiwas (Dahlberg and Almgren), and Doughnuts (Almgren). In 2007, Inge Johansson also played in the band The Most.
Document 8: Ny Våg: Ny Våg is an independent record label founded by Dennis Lyxzén and Inge Johansson in 2005. It focuses on releases by bands associated with the large punk and hardcore scene in Umeå, Sweden, where the label is based.
Document 9: Dennis Lyxzén: Dennis Lyxzén (born June 19, 1972 in Umeå, Sweden) is a musician best known as the lead vocalist for Swedish hardcore punk band Refused. He is currently the vocalist in INVSN.
Document 10: INVSN: INVSN (pronounced "Invasion") is a Post-Punk band from Umeå in the North of Sweden. The members have all played in influential punk and rock bands from Sweden. It is the music project of Swedish Punk rock musician Dennis Lyxzén. In contrast to his other projects, Refused and The (International) Noise Conspiracy, this started out as a solo career and much more folkish and softer than his prior music endeavors.
Document 11: Marc Biedermann: Mark H. Biedermann is an American heavy metal guitarist, vocalist, bassist and songwriter. He is best known for as the driving force behind the progressive band Blind Illusion. He has also played on Blue Öyster Cults "Imaginos" and Heathens "Victims of Deception" albums. Marc Biedermann was laying down a monstrous track for a Blind Illusion album, recorded and mastered at Hyde Street where manager of Blue Öyster Cult, Sandy Pearlman, overheard. Pearlman on the spot, went over, introduced himself, and invited Biedermann to be in the Guitar Orchestra of Imaginos.
Document 12: 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 13: Inge Johansson: Inge Johansson ( ) (born May 10, 1977) is the bass player of the Florida-based punk band Against Me!. He was previously the bass player of the politically charged punk/rock band The (International) Noise Conspiracy, formed in Umeå, Sweden in 1998 with Dennis Lyxzén, Sara Almgren, Ludwig Dahlberg and Lars Strömberg. Before forming The (International) Noise Conspiracy, Johansson was one of the many bass players that played in the straight edge hardcore band Refused. The (International) Noise Conspiracy recorded and played more than 700 shows worldwide as an active band between 1998 and 2009, and recorded two of their albums with producer Rick Rubin for Rubins label American Recordings.
Document 14: 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 15: Chimaira discography: The discography of American heavy metal band Chimaira consists of seven studio albums, two extended plays, eleven singles, two video albums and eleven music videos. Chimaira originated in Cleveland, Ohio, composed of vocalist Mark Hunter, guitarists Jason Hager and Rob Arnold, bassist Jim LaMarca, drummer Andols Herrick and programmer Chris Spicuzza. Hager would later be replaced by Matt DeVries in 2001. Chimaira's first release was an extended play, "This Present Darkness", which sold 10,000 copies. After signing to Roadrunner Records, the band's debut studio album, "Pass Out of Existence", was released in August 2001. A second studio album, "The Impossibility of Reason", followed in 2003, debuting and peaking at number 117 on the "Billboard" 200. Herrick was replaced by drummer Kevin Talley, formerly of Misery Index, in 2004. A video album, "The Dehumanizing Process", arrived later that year, documenting the writing and recording process behind "The Impossibility of Reason". Chimaira released a self-titled album in August 2005, which peaked at number 74 on the "Billboard" 200. After an internal crisis due to pressure from the label by a new release, the band moved on from Roadrunner and signed a new deal with Ferret Music. In early 2006, Herrick rejoined the band and Chimaira recorded their fourth studio album "Resurrection", which appeared in early March 2007. "Resurrection" peaked at number 42 on the "Billboard" 200.
ground_truth: vocalist