Question: Are Danny Shirley and Serri both singers?

full_context: Document 1: Park Gyu-ri: Park Gyu-ri (born May 21, 1988), better known by the mononym Gyuri, is a South Korean singer, actress, and radio personality. She was a member of South Korean girl group Kara.
Document 2: Han Seung-yeon: Han Seung-yeon (born July 24, 1988), better known mononymously as Seungyeon, is a South Korean singer and actress. She is best known as former main vocalist of the South Korean girl group Kara.
Document 3: Seohyun: Seo Ju-hyun (born June 28, 1991), known professionally as Seohyun, is a South Korean singer and actress. She debuted as a member of girl group Girls' Generation (and later its subgroup TTS) in August 2007, who went on to be one of the best-selling artists in South Korea and one of South Korea's most popular girl groups worldwide. Apart from her group's activities, she has established herself as an actress, notably through her participation in the original and Korean versions of stage musicals including "Moon Embracing the Sun", "Gone with the Wind" and "Mamma Mia". She also starred in the drama "". She debuted as a solo artist with her debut mini album, "Don't Say No", on January 17, 2017, making her the third Girls' Generation member to debut as a solo artist.
Document 4: Bae Woo-hee: Bae Woo-hee (born November 21, 1991), better known mononym Woohee, is a South Korean singer, songwriter and actress. She is best known as a member of the South Korean girl group Dal Shabet.
Document 5: Charlie Daniels: Charles Edward "Charlie" Daniels (born October 28, 1936) is an American multi-instrumentalist, actor, lyricist, and singer, known for his contributions to country, bluegrass, and Southern rock music. He is perhaps best known for his number one country hit "The Devil Went Down to Georgia". Daniels has been active as a singer and musician since the 1950s. He was inducted into the Grand Ole Opry on January 24, 2008 and the Musicians Hall of Fame and Museum in 2009. Daniels was inducted into the Country Music Hall of Fame in 2016. He is known for portraying himself in "Urban Cowboy", "Yakety Yak, Take it Back", "Trash Talk", "The Fall Guy" and "King of the Hill", as well as appearances in "The Lone Star Kid", "18 Wheels of Justice" and "Murder, She Wrote" playing other characters.
Document 6: George Strait: George Harvey Strait (born May 18, 1952) is an American country music singer, songwriter, actor, and music producer. He is known as the "King of Country" and is considered one of the most influential and popular recording artists of all time. He is known for his neotraditionalist country style, cowboy look, and being one of the first and main country artists to bring country music back to its roots and away from the pop country era in the 1980s.
Document 7: Confederate Railroad: Confederate Railroad is an American country rock–Southern rock band founded in 1987 in Marietta, Georgia, by Danny Shirley (lead vocals, rhythm guitar), Michael Lamb (lead guitar), Mark Dufresne (drums), Chris McDaniel (keyboards), Warren "Gates" Nichols (steel guitar) and Wayne Secrest (bass guitar). After serving as a backing band for outlaw country acts David Allan Coe and Johnny Paycheck, the band signed to a recording contract with Atlantic Records, releasing their self-titled debut album that year. In the 1990s, they released four more albums for Atlantic.
Document 8: Serri (singer): Park Mi-yeon (born September 16, 1990), better known by the stage name Serri, is a South Korean singer, songwriter and actress. She is best known as a member and leader of the South Korean girl group Dal Shabet.
Document 9: Mi Mi Mi: "Mi Mi Mi" is a song by Russian girl group Serebro from their upcoming third studio album. It was released on 14 June 2013 in Russia as a digital download, while an accompanying music video premiered a few days earlier on 10 June 2013. Although not a commercial success worldwide, only peaking at number 11 in Italy, the song slowly gained popularity for its catchiness and summer atmosphere. The song is played in many clubs worldwide, as well as in movies and television shows, especially in South Korea.
Document 10: Marty Raybon: Marty Raybon (born December 8, 1959) is an American country music artist. He is known primarily for his role as the lead singer of the band Shenandoah, a role which he held from 1985 to 1997, until he rejoined the band in 2014. He recorded his first solo album, "Marty Raybon", in 1995 on Sparrow Records. Before leaving Shenandoah in 1997, he and his brother Tim formed a duo known as the Raybon Brothers, which had crossover success that year with the hit single "Butterfly Kisses".
Document 11: Park Subin: Park Su-bin (born February 12, 1994), better known by the mononym Subin, is a South Korean singer, songwriter and television host. She is best known as a member of South Korean girl group Dal Shabet.
Document 12: Shenandoah (band): Shenandoah is an American country music group founded in Muscle Shoals, Alabama in 1984 by Marty Raybon (lead vocals, acoustic guitar), Ralph Ezell (bass guitar, backing vocals), Stan Thorn (keyboards, backing vocals), Jim Seales (lead guitar, backing vocals), and Mike McGuire (drums, background vocals). Thorn and Ezell left the band in the mid-1990s, with Rocky Thacker taking over on bass guitar; Keyboardist Stan Munsey joined the line up in 1995. The band split up in 1997 after Raybon left. Seales, Munsey, Thacker and McGuire reformed the band in 2000 with lead singer Brent Lamb, who was in turn replaced by Curtis Wright and then by Jimmy Yeary. Ezell rejoined in the early 2000s, and after his 2007 death, he was replaced by Mike Folsom. Raybon returned to the band in 2014. That same year, Jamie Michael replaced the retiring Jim Seales on lead guitar.
Document 13: Danny Shirley: Danny Shirley (born August 12, 1956) is an American country music singer. He is best known as the lead singer of the country rock band Confederate Railroad, a role he has held since its formation in 1987.
Document 14: Park Si-yeon: Park Si-yeon (born Park Mi-seon on March 29, 1979) is a South Korean actress. She joined the Miss Korea pageant in 2000, and using that as a springboard to an acting career, she made her acting debut in China in 2004, appearing in minor roles in several CCTV dramas. In 2005 Park was cast in her first starring role in the Korean drama "My Girl", though at the time she was more known for dating actor-singer Eric Mun. As she built her filmography in the following years, Park overcame early criticism of her acting skills and eventually gained respect as an actress in TV series such as "La Dolce Vita", "Coffee House" and "The Innocent Man", as well as the films "The Fox Family", "A Love", and "The Scent".
Document 15: Randy Travis: Randy Bruce Traywick (born May 4, 1959), better known by his stage name, Randy Travis, is an American country music singer, songwriter, guitarist, and actor. Since 1985, he has recorded 20 studio albums and charted more than 50 singles on the "Billboard" Hot Country Songs charts, and 16 of these were number-one hits. Considered a pivotal figure in the history of country music, Travis broke through in the mid-1980s with the release of his album "Storms of Life", which sold more than four million copies. The album established him as a major force in the Neotraditional country movement. Travis followed up his successful debut with a string of platinum and multi-platinum albums. He is known for his distinctive baritone vocals, delivered in a traditional style that has made him a country music star since the 1980s.
ground_truth: yes