Question: Who is a current member of the group Guy, Aaron Hall or Matt Thiessen?

full_context: Document 1: Matthew Sweet: Sidney Matthew Sweet (born October 6, 1964) is an American rock singer-songwriter and musician. He was part of the burgeoning music scene in Athens, Georgia, during the 1980s before gaining commercial success in the 1990s. His twelfth album, "Tomorrow Forever", was released in June 2017.
Document 2: Matt Thiessen: Matthew Arnold "Matt" Thiessen (born August 12, 1980) is a Canadian-American musician, singer and songwriter known for being co-founder, lead singer, guitarist, pianist, and primary songwriter for the Christian rock band Relient K. With Relient K, he has released eight full-length albums, including three that were certified Gold, and three that peaked in the top twenty on the "Billboard" 200. Outside of his work with Relient K, Thiessen maintains a low-profile side project called Matthew Thiessen and the Earthquakes. In 2009, he co-produced and collaborated on Owl City's album "Ocean Eyes".
Document 3: Guy III (album): Guy III is the third and most recent studio album from American R&B group Guy, released January 25, 2000 on MCA Records. The album peaked at number thirteen on the "Billboard" 200 chart. At the time of its release, not all of the members were on the same page for the release of "Guy III". Founding member Teddy Riley remained hopeful that his group Blackstreet would record another album despite the friction between him and group member Chauncey Hannibal. Aaron Hall insisted on recording another solo album, while his brother Damion Hall was interested in an acting career.
Document 4: Aaron Hall (singer): Aaron Hall (born August 10, 1964, The Bronx, New York City and growing up in Brooklyn and Roosevelt, Long Island), is an American soul singer and songwriter. He is a current member of the group Guy, which he founded in the late 1980s, along with New jack swing producer Teddy Riley and songwriter Timmy Gatling, who was later replaced by Hall's brother Damion Hall. In 1988, they released their debut album which went on to sell over a million copies being certified platinum. Hall led the group in songs like "Groove Me", "I Like" and "Piece Of My Love".
Document 5: Matt Oberst: Matt Oberst (  1974 – 2016) was an American musician. He was the brother of Bright Eyes frontman Conor Oberst. He was in the band Sorry About Dresden since 1996. He is also listed as helping with the creation/production of a few Bright Eyes albums, and a few albums released under Saddle Creek Records.
Document 6: Matt Johnson (singer): Matt Johnson (born 15 August 1961) is an English singer-songwriter. He is best known as the vocalist and only constant member of his band The The. He is also a film soundtrack composer ("Cineola"), publisher ("Fifty First State Press"), broadcaster ("Radio Cineola"), and conservationist/local activist (Save Shoreditch).
Document 7: Relient K: Relient K is an American rock band formed in 1998 in Canton, Ohio, by Matt Thiessen, Matt Hoopes, and Brian Pittman during the band members' third year in high school and their time at Malone University. The band is named after guitarist Hoopes' automobile, a Plymouth Reliant K car, with the spelling intentionally altered to avoid trademark infringement over the "Reliant" name.
Document 8: Damion Hall: Damion Hall, also known as Damion "Crazy Legs" Hall is an African-American R&B singer. He is a member of the new jack swing group Guy and is the brother of Guy member, Aaron Hall. He has released one solo album, Straight to the Point in 1994, which spawned one single, "Satisfy You", featuring Chanté Moore. That song managed to reach #48 on the Billboard R&B charts. He is currently unsigned.
Document 9: My Girlfriend (Relient K song): "My Girlfriend" is a song by the Christian rock band Relient K, released on their self-titled first album. The song originally appeared as "Marilyn Manson Ate My Girlfriend" on the band's demo album, "All Work and No Play". The song is about Marilyn Manson eating Matt Thiessen's girlfriend. Thiessen wrote this song when he was 15 years old. Thiessen has said that he wrote it because of a female friend, who lived eight hours away in Pennsylvania, who he would talk to about many things including spiritual matters such as where God was taking them in the future. His friend would later turn from Christian music to Nine Inch Nails and Marilyn Manson. In an interview with CCM Magazine Thiessen stated "through this she changed her lifestyle [and] what she believed in." His friend would later be expelled from school and would be kicked out of her house and sent to a youth detention center. Thiessen would later state "She felt that Christianity was stupid and just this big hypocrisy. Being young and impressionable, I just wrote this little, stupid song, but that was the way I dealt with it—writing this song about how she got so consumed by Marilyn Manson."
Document 10: Daryl Hall: Daryl Franklin Hohl (born October 11, 1946), known professionally as Daryl Hall, is an American rock, R&B, and soul singer; keyboardist, guitarist, songwriter, and producer, best known as the co-founder and lead vocalist of Hall & Oates (with guitarist and songwriter John Oates).
Document 11: New Edition: New Edition is an American R&B group from the Roxbury neighborhood of Boston, Massachusetts formed in 1978. The group reached its height of popularity in the 1980s. During the group's first experience with fame in 1983, its members were Ricky Bell, Michael Bivins, Bobby Brown, Ronnie DeVoe and Ralph Tresvant. Early hits included "Candy Girl," "Cool It Now", and "Mr. Telephone Man". Brown was voted out of the group in 1985 and embarked on a solo career. The group continued for a time with its remaining four members, but eventually recruited singer Johnny Gill, who would be introduced on their 1988 album "Heart Break". The group went on hiatus in 1990, while its various members worked on side projects, such as the group Bell Biv DeVoe. Gill and Tresvant also recorded successful solo albums.
Document 12: Haleek Maul: Malik Hall (born in 1996), better known by his stage name Haleek Maul, is an American rapper born in Brooklyn, New York and based in Barbados. He is also known as Kidgns (pronounced "Kid Genius"). He is a founding member of the collective called On the Tanz. He has collaborated with the likes of Deniro Farrar, Shady Blaze, Hot Sugar, and Saul Williams. In 2012, "Noisey" described him as "the new hustler of horrorcore".
Document 13: The Future (Guy album): The Future is the second studio album from American R&B group Guy, released in November 13, 1990 on Uptown Records and MCA Records. The album had a much darker tone in stark contrast to their debut. Most of it had to do with things going on behind the scenes. A year after the release of their debut album, they fired their manager Gene Griffin- who they claimed allocated funds from the group. This revelation angered all of the members, and particularly infuriated lead singer Aaron Hall- so much so that he didn't sing on half of the album. Hall revealed:
Document 14: Matt de Jong: Matt de Jong is a graphic designer and art director who specializes in album art and related promotional materials for musicians. He has designed album covers for artists including Cat Power, Clean Bandit, Deerhunter, Future Islands, Little Dragon, The Maccabees, Paolo Nutini, Lee Ranaldo, Ratking, and Vampire Weekend. de Jong is known for working with musicians who have a reputation for being "difficult" and nevertheless creating album art that pleases them. Lionel Skerratt, who co-founded Public Information Records, and Orlando Weeks, lead singer of The Maccabees, are childhood friends of de Jong's.
Document 15: Hall &amp; Oates: Daryl Hall and John Oates, often referred to as Hall & Oates, are an American musical duo from Philadelphia. Daryl Hall is generally the lead vocalist of the pairing. John Oates primarily plays electric guitar and provides backing vocals. The two write most of the songs they perform, either separately or in collaboration. They achieved their greatest fame from the late 1970s to the mid-1980s with a fusion of rock and roll and rhythm and blues.
ground_truth: Aaron Hall