Question: Are Kyosuke Himuro and Serri both singers and songwriters?

full_context: Document 1: Kyo (musician): Kyo (京 , Kyō ) is a Japanese musician, poet and singer-songwriter. He is best known as the vocalist of the metal band Dir en grey. He has been with the band since its inception in 1997 and was formerly in La:Sadie's. Kyo was inspired to become a musician when he saw a picture of Buck-Tick vocalist Atsushi Sakurai on the desk of a junior high school classmate. His vocals span a tenor range.
Document 2: 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 3: 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 4: 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 5: Flowers for Algernon (album): Flowers for Algernon is the first solo album by Japanese singer Kyosuke Himuro. Japanese rock group Boøwy, to which he once belonged, disbanded and this album was released as his solo debut five months later.
Document 6: 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 7: Takuya Kimura: Takuya Kimura (木村 拓哉 , Kimura Takuya , born November 13, 1972) , also known as Kimutaku, is a Japanese actor, singer, radio personality. He is regarded as a Japanese icon after achieving an unprecedented success as an actor and influencing Japanese culture, and established himself as one of the most successful celebrities in Asia.
Document 8: Kazutoshi Sakurai: Kazutoshi Sakurai (桜井 和寿 , Sakurai Kazutoshi , born 櫻井 和寿 , March 8, 1970 in Tokyo) is a Japanese musician. He composes and writes almost all of the songs for his band Mr. Children, in addition to writing lyrics and singing for his solo project group Bank Band. In 2006, Sakurai ranked #8 in HMV's "Top 30 Best Japanese Singers of All Time" and in 2007 was voted #4 as the "ideal father image" by Oricon. Also, in 2009, he was chosen as one of the Young Global Leaders in World Economic Forum. As an entrepreneur, he co-founded AP Bank, where he personally provided 1 million dollars of seed money to launch and fund the nonprofit lending group which finances environmentally friendly projects.
Document 9: 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 10: Kyosuke Himuro: Kyosuke Himuro (氷室 京介 , Himuro Kyōsuke , born October 7, 1960 in Takasaki, Gunma, Japan) is a Japanese singer-songwriter and musician. He was a lead vocalist of the rock band Boøwy from 1981 to 1988. After the group disbanded he started a successful solo career, becoming one of Japan's best-selling artists. In 2003, HMV Japan ranked Himuro at number 76 on their list of the 100 most important Japanese pop acts. He currently lives in Los Angeles, California, where he purchased a palatial residence in Beverly Hills in 2004, which was previously owned by Shaquille O'Neal.
Document 11: Ryuichi Sakamoto: Ryuichi Sakamoto (坂本 龍一 , Sakamoto Ryūichi , born January 17, 1952) (] ) is a Japanese musician, composer, record producer, pianist, activist, writer, actor and dancer, based in Tokyo and New York. He began his career while a university student as a session musician, producer, and arranger in the 1970s, first gaining major success in 1978 as one third of the electronic music group Yellow Magic Orchestra (YMO). The band had worldwide hits such as "Computer Game / Firecracker" (1978), "Behind the Mask" (1978), and "Rydeen" (1979), playing a pioneering role in the development of the synthpop, techno and house genres.
Document 12: 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 13: 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 14: Boøwy: Boøwy (pronounced: bóui, stylized as BOØWY) was a Japanese rock band formed in Takasaki, Gunma in 1981. The best-known lineup of Kyosuke Himuro (vocals), Tomoyasu Hotei (guitar), Tsunematsu Matsui (bass) and Makoto Takahashi (drums) reached legendary status in Japan during the 1980s.
Document 15: Toshi (musician): Toshimitsu Deyama (出山利三 , Deyama Toshimitsu , born October 10, 1965 in Tateyama, Chiba) , known exclusively by his stage name Toshi, is a Japanese singer and songwriter. He is best known as the lead vocalist and a co-founder of the heavy metal band X Japan, which disbanded in 1997. Toshi then went on to have an extensive solo career. In 2007, X Japan reunited and began an ongoing world tour in 2010. His distinctive, impassioned tenor vocals have been compared to those of Steve Perry.
ground_truth: yes