Question: Do Robb Flynn and G.O. both play in the heavy metal band Machine Head?

full_context: Document 1: Byul: Kim Go-eun (Korean: 김고은 ), known by her stage name of 별 (Byul, "star"), is a South Korean singer.
Document 2: Gongchan: Gong Chan-sik (born August 14, 1993), better known by his stage name Gongchan, is a South Korean singer and actor. He is a member of the South Korean boy group B1A4.
Document 3: Seungri: Lee Seung-hyun (Hangul: 이승현; born December 12, 1990), better known by his stage name Seungri (Hangul: 승리, "Victory") and V.I when performing in Japan, is a South Korean singer, songwriter, record producer, actor, and entrepreneur. In the mid-2000s, Seungri rose to prominence as one of three vocalists and youngest member of the South Korean boy band Big Bang under YG Entertainment, which eventually became one of the best-selling digital group of all-time in Asia and one of the best-selling boy bands in the world. With the release of the group's second studio album "Remember" (2008), in which the second single released, "Strong Baby", was performed solely by Seungri, he began to adopt a more mature image as an artist.
Document 4: Conrad Lant: Conrad Thomas Lant (born 15 January 1963), also known by the stage name of Cronos, is an English musician. He is the vocalist and bass player of the influential Thrash metal/black metal band Venom, from 1979 to 1989 and from 1994 to present.
Document 5: G.O (singer): Jung Byung-hee (Hangul:  ; Hanja:  ; November 6, 1987), better known by his stage name G.O, is a South Korean singer-songwriter and actor. He is best known as a member of South Korean boy group MBLAQ.
Document 6: Yook Sung-jae: Yook Sung-jae (; born (1995--) 2, 1995 ) is a South Korean singer, actor and host. He is a member of the boy group BtoB and its sub-group, BtoB Blue. Aside from his group's activities, Yook is known for acting in television dramas, "" (2015), "" (2015) and "" (2016).
Document 7: Machine Head (band): Machine Head is an American heavy metal band from Oakland, California. Formed on October 12, 1991, the group was founded by vocalist/guitarist Robb Flynn and bassist Adam Duce. The current lineup of the band comprises Flynn, drummer Dave McClain, guitarist Phil Demmel and bassist Jared MacEachern. Machine Head is one of the pioneering bands in the new wave of American heavy metal.
Document 8: JB (South Korean singer): Lim Jae-beom (Hangul: 임재범; born January 6, 1994) commonly known by his stage name JB (Hangul: 제이비), is a South Korean singer, songwriter and actor. He is a member of South Korean boyband Got7, and part of the duo JJ Project. JB made his small-screen debut through the drama series "Dream High 2" in 2012. He has also starred in MBC's "When a Man Falls in Love" as Seo-Min Joon.
Document 9: G-Dragon: Kwon Ji-yong (; born August 18, 1988), better known by his stage name G-Dragon, is a South Korean rapper, singer-songwriter, record producer, and fashion icon. After six years as a trainee under the record label YG Entertainment, G-Dragon rose to fame in the mid-2000s as one of two rappers in the South Korean hip hop boy band Big Bang. Despite initial lukewarm receptions, the group became one of the best-selling digital groups of all-time in Asia and one of the best-selling boy bands in the world.
Document 10: G.O (singer): Jung Byung-hee (Hangul:  ; Hanja:  ; November 6, 1987), better known by his stage name G.O, is a South Korean singer-songwriter and actor. He is best known as a member of South Korean boy group MBLAQ.
Document 11: Unto the Locust: Unto the Locust is the seventh full-length studio album by American groove metal band Machine Head, released in Australia on September 23, in the UK on September 26 and worldwide on September 27, 2011. The album was produced and mixed by Robb Flynn, and it was the band's highest charting album ever, charting at 22 on the "Billboard" 200, until their following release "Bloodstone & Diamonds" charted at 21. "Unto the Locust" was recorded in Green Day's Jingletown Studios. On June 14, 2011, Machine Head released the advance mix of their album track "Locust", which was included on the 2011 Mayhem Festival iTunes sampler. This would be Machine Head's last studio album with co-founder and bassist Adam Duce before he was fired due to "ongoing differences" with the band on February 11, 2013. It has sold over 100,000 copies in the United States. At just under 49 minutes long it is the band's shortest album released to date.
Document 12: Phil Demmel: Phil Demmel (born April 2, 1967) is the lead guitarist for American heavy metal band Machine Head, and is currently their longest running member in that position. He was also a founding member of Vio-lence, which also included Machine Head guitarist/vocalist Robb Flynn. Demmel was also a member of Torque.
Document 13: Machine Fucking Head Live: Machine Fucking Head Live is the second live album from the American heavy metal band Machine Head. And it is the final release to include bassist Adam Duce who was fired, due to ongoing differences on February 11, 2013. The album was released on November 13, 2012, under Roadrunner Records. It was recorded at Central, Manchester on December 6, 2011 (except Locust & Halo recorded at SECC, Glasgow on December 5, 2011). "The Head Cases [Machine Head's nickname for their fans] have been so intense on this tour cycle that we had to start capturing the shows, especially with technology making it so much easier to record," said frontman Robb Flynn. "We culled some of the best nights where the band and crowd were on fire and made a badass, nearly two-hour, double live album, which is a great documentation of where the band is at, 18 years deep."
Document 14: Robbie Crane: Robert Crane (born January 5, 1969 in Orange County, California) is the current bass guitarist with hard rock band Black Star Riders. He is also a member of Ricky Warwick's band The Fighting Hearts. He was previously the bassist with the band Ratt.
Document 15: Robb Flynn: Robert Conrad "Robb" Flynn (born Lawrence Matthew Cardine; July 19, 1967) is the lead vocalist and guitarist for the heavy metal band Machine Head. Flynn formed the band along with Adam Duce, Logan Mader and Tony Costanza after leaving Bay Area thrash band Vio-Lence.
ground_truth: no