Question: Gregg Rolie and Rob Tyner, are a keyboardist?

full_context: Document 1: Sammy Hagar: Samuel Roy Hagar (born October 13, 1947), also known as The Red Rocker, is an American rock vocalist, guitarist, songwriter, musician and entrepreneur. Hagar came to prominence in the 1970s with the hard rock band Montrose. He afterwards launched a successful solo career, scoring an enduring hit in 1984 with "I Can't Drive 55". He enjoyed huge commercial success when he replaced David Lee Roth as the lead singer of Van Halen in 1985, but left the band in 1996. He returned to the band for a 2-year reunion from 2003 to 2005. On March 12, 2007, Hagar was inducted into the Rock and Roll Hall of Fame as a member of Van Halen. His musical style primarily consists of hard rock and heavy metal.
Document 2: Rick Lober: Rick Lober is the original keyboardist of the 1960s Detroit rock band The Amboy Dukes. His band mates were Ted Nugent, Steve Farmer, John Drake, Dave Palmer and Bill White.
Document 3: Greg Lake: Gregory Stuart Lake (10 November 1947 – 7 December 2016) was an English bassist, guitarist, singer, songwriter, and producer who gained prominence as a founder member of the progressive rock bands King Crimson and Emerson, Lake & Palmer (ELP).
Document 4: Rob Hyman: Robert Andrew "Rob" Hyman (born April 24, 1950 in Meriden, Connecticut, U.S.) is an American singer, songwriter, keyboard player, accordion player, producer, arranger and recording studio owner, best known for being a founding member of the rock band The Hooters.
Document 5: Kick Out the Jams: Kick Out the Jams is the debut album by American protopunk band MC5. It was released in February 1969, through Elektra Records. It was recorded live at Detroit's Grande Ballroom over two nights, Devil's Night and Halloween 1968. The LP peaked at No. 30 on the "Billboard" 200 chart, with the title track peaking at No. 82 in the Hot 100. Although the album received an unfavorable review in "Rolling Stone" magazine upon its release, it has gone on to be considered an important forerunner to punk rock music, and in 2003 was ranked number 294 on "Rolling Stone"'s "500 Greatest Albums of All Time" list.
Document 6: Steve Perry: Stephen Ray "Steve" Perry (born January 22, 1949) is an American singer, songwriter and record producer. He is best known as the lead singer of the rock band Journey during their most commercially successful periods from 1977 to 1987 and again from 1995 to 1998. Perry had a successful solo career between the mid-1980s and mid-1990s.
Document 7: Welcome (Santana album): Welcome is the fifth studio album by Santana, released in 1973. It followed the jazz-fusion formula that the preceding "Caravanserai" had inaugurated, but with an expanded and different lineup this time. Gregg Rolie had left the band along with Neal Schon to form Journey, and they were replaced by Tom Coster, Richard Kermode and Leon Thomas, along with guest John McLaughlin, who had collaborated with Carlos Santana on "Love Devotion Surrender". "Welcome" also featured John Coltrane's widow, Alice, as a pianist on the album's opening track, "Going Home" and Flora Purim (the wife of Airto Moreira) on vocals. This album was far more experimental than the first four albums, and "Welcome" did not produce any hit singles.
Document 8: Robert Balderrama: Robert "Bobby"Lee Balderrama, born in O'Donnell, Texas, grew up in Saginaw, Michigan, is the lead guitarist for the band Question Mark & the Mysterians and was so when they recorded their first hit song 96 Tears. He later played with Joe King Carrasco and the Crowns on the "Bandido Rock" album of 1987. He still periodically plays shows with the original members of ? and the Mysterians. Robert Lee Balderrama also has formed a Smooth Jazz group "Robert Lee Revue"
Document 9: MC5: MC5 was an American rock band from Lincoln Park, Michigan, formed in 1964. The original band line-up consisted of vocalist Rob Tyner, guitarists Wayne Kramer and Fred "Sonic" Smith, bassist Michael Davis, and drummer Dennis Thompson. "Crystallizing the counterculture movement at its most volatile and threatening", according to "AllMusic" critic Stephen Thomas Erlewine, the MC5's leftist political ties and anti-establishment lyrics and music positioned them as emerging innovators of the punk movement in the United States. Their loud, energetic style of back-to-basics rock and roll included elements of garage rock, hard rock, blues rock, and psychedelic rock.
Document 10: Gregg Rolie: Gregg Alan Rolie (born June 17, 1947, Seattle, Washington, United States) is an American singer and keyboardist. Rolie served as lead singer of the bands Santana, Journey and Abraxas Pool – all of which he co-founded. He also helmed rock group The Storm, and currently performs with his Gregg Rolie Band. Rolie is a two-time inductee of the Rock and Roll Hall of Fame, having been inducted both as a member of Santana in 1998 and as a member of Journey in 2017.
Document 11: Rob Tyner: Robert W. Derminer (December 12, 1944 – September 18, 1991), known as Rob Tyner, was an American musician best known as lead singer for the Detroit proto-punk band, MC5. His adopted surname was in tribute to the jazz pianist McCoy Tyner. It was Tyner who issued the rallying cry of "kick out the jams, motherfuckers" at the MC5's live concerts. Tyner had originally auditioned as the bass player, but the band felt his talents would be best used as a lead vocalist.
Document 12: J. Robert Bradley: John Robert Lee Bradley (October 5, 1919 – May 3, 2007) was an American gospel music singer. He was the favorite singer of the Rev. Dr. Martin Luther King Jr. and was nicknamed "Mr. Baptist." Mahalia Jackson once said he had the greatest voice she had ever heard, stating "Nobody need mess with 'Amazing Grace' after Bradley gets through with it."
Document 13: José Areas: José Octavio "Chepito" Areas (born 25 July 1946) is a Nicaraguan percussionist best known for having played timbales in the Latin rock group Santana from 1969-1977 and 1987-1989. In 1998, he was inducted into the Rock & Roll Hall of Fame for his work in Santana. In 1997, he performed on "Abraxas Pool" with other members of the early 1970s iteration of Santana, including Gregg Rolie, Neal Schon, Michael Carabello and Michael Shrieve. Previously, he released an eponymous solo album on Columbia/CBS Records in 1974. "La Gigantona", a 1976 collaboration with Nicaraguan singer-songwriter and childhood friend Alfonso Noel Lovo, was reissued by Numero Group in 2012. Featured along with Richard Bean in "The Sounds of Santana" CD by Mike Roman & The Tellstars (2003). Featured along with Michael Shrieve in "Cha Cha Time!" CD by Mike Roman & The Tellstars (2007).
Document 14: Abraxas Pool: Abraxas Pool is a 1997 album by ex-Santana members Mike Shrieve, Neal Schon, Gregg Rolie, José "Chepito" Areas, Alphonso Johnson, and Mike Carabello.
Document 15: Neal Schon: Neal Joseph Schon (born February 27, 1954) is an American rock guitarist, songwriter, and vocalist, best known for his work with the bands Journey and Bad English. He is Journey's last original constant member, having participated in every album and tour to date. He was a member of the rock band Santana before forming Journey, and was also an original member of Hardline.
ground_truth: no