Question: What do Ann Wilson and Keith Morris have in common?

full_context: Document 1: June Anderson: June Anderson (born December 30, 1952) is a Grammy Award-winning American dramatic coloratura soprano. Originally known for "bel canto" performances of Rossini, Donizetti, and Vincenzo Bellini, she was the first non-Italian ever to win the prestigious Bellini d'Oro prize. Subsequently, she has extended her repertoire to include a wide variety of other roles, including those from the Russian repertoire and works by Richard Strauss. In 2008, Anderson was elevated to "Commandeur" of the Ordre des Arts et des Lettres by the French Government and in 2007 received a "Victoire d'honneur" at the "Victoires de la Musique Classique" in Paris.
Document 2: Keith Morris (disambiguation): Keith Morris (born 1952) is the co-founder and former lead singer of the punk rock band Black Flag.
Document 3: List of Circle Jerks band members: The Circle Jerks were an American punk rock band whose most recent lineup consisted of vocalist Keith Morris, guitarist Greg Hetson, bassist Zander Schloss, and drummer Kevin Fitzgerald. The band was formed in Southern California in 1979, and originally comprised Morris on vocals, Hetson on guitar, Roger Rogerson on bass and Lucky Lehrer on drums.
Document 4: Dramatic soprano: A dramatic soprano is a type of operatic soprano with a powerful, rich, emotive voice that can sing over, or cut through, a full orchestra. Thicker vocal folds in dramatic voices usually (but not always) mean less agility than lighter voices but a sustained, fuller sound. Usually this voice has a lower tessitura than other sopranos, and a darker timbre. They are often used for heroic, often long-suffering, tragic women of opera. Dramatic sopranos have a range from approximately low A (A) to "high C" (C). Some dramatic sopranos, known as Wagnerian sopranos, have an exceptionally big voice that can assert itself over a large orchestra (of more than 80 or even 100 pieces). These voices are substantial, often denser in tone, extremely powerful and, ideally, evenly balanced throughout the vocal registers. Wagnerian sopranos usually play mythic heroines. Successful Wagnerian sopranos are rare and often Wagnerian roles are performed by Italianate dramatic sopranos.
Document 5: Heart (band): Heart is an American rock band that first found success in Canada and later in the United States and worldwide. Over the group's four-decade history, it has had three primary lineups, with the constant center of the group since 1973 being sisters Ann Wilson (lead singer) and Nancy Wilson (guitarist). Heart rose to fame in the mid-1970s with music influenced by hard rock and heavy metal, as well as folk music. Their popularity declined in the early 1980s, but the band enjoyed a comeback starting in 1985 and experienced even greater success with album-oriented rock hits and hard-rock ballads into the 1990s.
Document 6: Keith Morris: Keith Morris (born September 18, 1955) is an American singer and songwriter known for his role as frontman of the hardcore punk bands Black Flag, Circle Jerks, and Off!. Born and raised in Hermosa Beach, California, he formed Black Flag at the age of 21 with guitarist Greg Ginn and performed on the band's 1979 debut EP "Nervous Breakdown". Shortly after leaving Black Flag in 1979, he formed the Circle Jerks with guitarist Greg Hetson; the band released seven albums between 1980 and 1995 and are currently on hiatus. In 2009 Morris formed the supergroup Off! with guitarist Dimitri Coats, bassist Steven Shane McDonald, and drummer Mario Rubalcaba. Morris has also appeared as a guest vocalist on several albums by other artists.
Document 7: List of Heart band members: Heart is an American rock band that first found success in Canada and later in the United States and worldwide. Over the group's four-decade history it has had three primary lineups, with the constant center of the group since 1974 being sisters Ann Wilson (lead singer) and Nancy Wilson (guitarist). While it has been referred to as a duo because of the focus on leaders Ann and Nancy Wilson, Heart is a full rock group. In its original lineup the band had six members, then five in its second incarnation, and is again at six currently.
Document 8: The Offspring: The Offspring is an American rock band from Garden Grove, California, formed in 1984. Originally formed under the name Manic Subsidal, the band has consisted of lead vocalist and rhythm guitarist Dexter Holland, bassist Greg K., lead guitarist Kevin "Noodles" Wasserman and drummer Pete Parada since 2007. While Holland, Greg K., and Noodles have been constant members since the band was formed, the Offspring has gone through a number of drummers. Their longest-serving drummer was Ron Welty, who had been a member of The Offspring for 16 years; he was replaced by Atom Willard in 2003, and then four years later by Parada. The band is often credited—alongside fellow California punk bands Green Day, Bad Religion, NOFX, Pennywise and Rancid—for reviving mainstream interest in punk rock in the 1990s. They have sold over 40 million records worldwide, being considered one of the best-selling punk rock bands of all time.
Document 9: Morrisson: Morrisson Kaye also spelled as Morrisson K. (formerly known as Morrisson) is an American singer, songwriter, producer and musician from the San Francisco Bay Area. He is the lead singer, bassist, and principle songwriter of Dawn Of Eros, an indie rock band he formed in 2011. Before then, he produced several demos in various musical genres in the late 1990s and early 2000s and his earliest official releases were underground deep, soulful house tracks for veteran DJ/Producer Julius Papp on Julius' NeoDisco label.
Document 10: Anette Olzon: Anette Ingegerd Olsson (born 21 June 1971), known by the stage name Anette Olzon, is a Swedish singer, best known as the lead vocalist of Finnish symphonic metal band Nightwish from 2007 to 2012. She is also the former vocalist of Swedish classic rock band Alyson Avenue.
Document 11: Cassandra Wilson: Cassandra Wilson (born December 4, 1955) is an American jazz musician, vocalist, songwriter, and producer from Jackson, Mississippi. Described by critic Gary Giddins as "a singer blessed with an unmistakable timbre and attack [who has] expanded the playing field" by incorporating blues, country, and folk music into her work, Wilson has won two Grammy Awards.
Document 12: List of the Offspring band members: The Offspring is an American punk rock band formed in Garden Grove, California in 1984. The band originally comprised vocalist Doug Thompson, guitarist Dexter Holland, bassist Greg K. and drummer Jim Benton, although Thompson and Benton left early on. After Holland took over vocal duties and James Lilja joined on drums, the group briefly added Marcus Parrish as a second guitarist, before Kevin "Noodles" Wasserman replaced him in 1985. After performing on the band's debut single "I'll Be Waiting" and co-writing the song "Beheaded", Lilja left the band in 1987 to be replaced by Ron Welty. In 1994, Chris "X-13" Higgins joined as a touring guitarist, keyboardist and percussionist.
Document 13: Sandi Patty: Sandra Faye "Sandi" Patty (born July 12, 1956) is an American Christian music singer, known for her wide vocal range and expressive flexibility which has led music critics to dub her "The Voice".
Document 14: The Bruisers: The Bruisers were pioneers of the American streetpunk/oi! movement, formed in Portsmouth, New Hampshire in 1988. The original lineup included: Al Barr (vocals, now the lead singer of the Boston Punk band Dropkick Murphys), Scotty Davies (bass), Jeff Morris (guitar) and Rodger Shosa (drums). Morris is now a guitarist and lead vocalist for Death & Taxes, and a former guitarist for Mark Lind & the Unloved. Former guitarist Rick Wimert died in the mid-1990s.
Document 15: Ann Wilson: Ann Dustin Wilson (born June 19, 1950) is an American musician, best known as the lead singer and songwriter of the hard rock band Heart. Wilson was listed as one of the "Top Heavy Metal Vocalists of All Time" by "Hit Parader" magazine in 2006. Wilson has a dramatic soprano vocal range.
ground_truth: American musician