Question: What do Constantine Maroulis and Janet Gardner have in common?

full_context: Document 1: John Lloyd Young: John Lloyd Mills Young (born July 4, 1975) is an American actor and singer. In 2006, he won the Tony Award for Best Leading Actor in a Musical for his role as Frankie Valli in Broadway's "Jersey Boys". He is the only American actor to date to have received a Lead Actor in a Musical Tony, Drama Desk, Outer Critics Circle and Theatre World Award for a Broadway debut. Young sang lead vocals on the Grammy-award winning "Jersey Boys" cast album, certified Platinum by the Recording Industry Association of America. Young reprised his role as Frankie Valli in Warner Brothers' film adaptation of "Jersey Boys", directed by Clint Eastwood and released June 20, 2014.
Document 2: Jonathan Groff: Jonathan Drew Groff (born March 26, 1985) is an American actor and singer.
Document 3: Janet Jackson: Janet Damita Jo Jackson (born May 16, 1966) is an American singer, songwriter, dancer and actress. Known for sonically innovative, socially conscious, and sexually provocative records, elaborate stage shows, and high-profile television and film roles, she has been a prominent figure in popular culture for over 30 years.
Document 4: George Constantine: George J. Constantine (February 22, 1918 in Southbridge, Massachusetts – January 7, 1968 in New York City) was a racing driver from the United States. He competed nationally in 108 races between 1953 and 1962, winning 17 times. Mr. Constantine was the United States Sports Car Driver of the Year in 1960. He won the 1959 Nassau Trophy race and the 1956 grand prix at Watkins Glen, N.Y. (in a Jaguar D-type). He set course records at Lime Rock, Conn. (1:05.81), and Marlboro, Md., in 1958, and he was one of the top-rated competitors in the 1959 Daytona, Fla. international speedway race. Mr. Constantine was known as the "King of Lime Rock" and "The Flying Greek." His most famous car with the most victories was the rare and fabulous Aston Martin DBR2/1 (owned by Elisha Walker, Jr.), and his mechanic was Rex Woodgate.
Document 5: Janet Gardner: Janet Patricia Gardner (born March 17, 1962 in Juneau, Alaska) is an American rock singer. She is best-known as the lead singer and rhythm guitarist of the all-woman hard rock band Vixen.
Document 6: Athan Maroulis: Athanasios Demetrios Maroulis (born September 22, 1964) is an actor, vocalist and record producer born in Brooklyn, New York. He is the older brother of singer Constantine Maroulis and also has a sister, Anastasia.
Document 7: Mia Zapata: Mia Katherine Zapata (August 25, 1965 – July 7, 1993) was the lead singer for the Seattle punk band The Gits.
Document 8: Constantine (album): Constantine is the solo debut album of rock singer Constantine Maroulis. It debuted at number 75 on the Billboard 200, selling around 9,000 copies in its first week.
Document 9: Joan Jett: Joan Marie Larkin (born September 22, 1958), known professionally as Joan Jett, is an American rock singer, songwriter, composer, musician, record producer and occasional actress.
Document 10: Constantine Maroulis: Constantine James Maroulis ( ; born September 17, 1975) is a Greek-American actor and rock singer from Wyckoff, New Jersey. He was the sixth-place finalist on the fourth season of the reality television series "American Idol", and received a nomination for the Tony Award for Best Performance by a Leading Actor in a Musical for his role in "Rock of Ages". He starred in the title role in "Jekyll and Hyde" on Broadway, for which he received a Drama League Award Nomination for a Distinguished Performance Award.
Document 11: Elena Siegman: Elena Siegman is an American singer, guitarist, songwriter and video game producer from Los Angeles. She moved to Boston, and is the former lead guitarist and one of the founders of an all-girl punk band named Vagiant, now known as Tijuana Sweetheart. As of January 2012, she sings in the Boston-based rock band "BrownBoot". (Metal Bands)
Document 12: Konstantinos Markoulakis: Konstantinos Markoulakis, born in Athens in 1970, is a Greek actor. He graduated from Athens College and he studied in Dramatic School of National Theatre. Since 1991, he has been working continuously in theatre, cinema and television. He has played in successful TV-series and he has won a television award for the TV-series Etsi Xafnika, in 2005. He has also won an Odysseas Award in 2013 London Greek Festival for the film "The Telemachy". Markoulakis is active in politics and he was candidate with Drassi.
Document 13: L7 discography: The discography of the rock band L7. L7 was formed by Donita Sparks and Suzi Gardner on shared electric guitar and shared vocals in 1985. A year prior, Gardner had performed backing vocals on the Black Flag song "Slip It In". The band also consisted of bassist Jennifer Finch and drummer Roy Koutsky (who was in the band for a year and a half). After their debut the band recruited Demetra Plakas as their permanent drummer. This line up continued through their albums, Smell the Magic in 1990 with Subpop records, with signing to the record label Slash the band had recorded three albums, Bricks Are Heavy in 1992, and Hungry for Stink in 1994. By the time 1996 came around Finch had wanted to leave. While the band was preparing to record their next album. Greta Brink had taken over bass for the new album, . Which was released in 1997. Gail Greenwood took over as their bassist for their final album, Slap-Happy which was produced by their own record company, Wax Tadpole records. After this the band started to break up when Greenwood left the band. Janis Tanaka had taken over bass. However the band ended up going into an hiatus, in 2001.
Document 14: Tangerine (Vixen album): Tangerine is the third album by American hard rock band Vixen. It was recorded without contributions from former members Jan Kuehnemund and Share Pedersen. The line-up for this album consisted of Janet Gardner and Roxy Petrucci. "Tangerine" has a different sound from the music of the previous albums of the band, more similar to Grunge than glam metal.
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: rock singer