Question: Billy Greer, is the current bass guitarist for the band Kansas, he also was a member of the brief 2009 Kansas side project "Native Window" along with David Ragsdale, he has been the violinist for which band, from 1991 to 1997 and from 2006 to the present?

full_context: Document 1: Billy Sheehan: William "Billy" Sheehan (born March 19, 1953), is an American bassist known for his work with Talas, Steve Vai, David Lee Roth, Mr. Big, Niacin, and The Winery Dogs. Sheehan has won the "Best Rock Bass Player" readers' poll from "Guitar Player" magazine five times for his "lead bass" playing style. Sheehan's repertoire includes the use of chording, two-handed tapping, right-hand "three-finger picking" technique and controlled feedback.
Document 2: Dave Hope: Dave Hope (born October 7, 1949) is an American bass guitarist who played with the American progressive rock band Kansas from 1970 (Original version) until the band's first split in 1983. When he was in high school, he played defensive center for his football team and became friends with many of the members who are still part of the band today. When he was in Kansas, he was known for his signature handlebar mustache and his nickname to many was "smokin Dave" as he was usually photographed with a cigarette dangling from his lips.
Document 3: Doug Grean: Doug Grean is an American record producer, audio engineer, guitarist, based in Los Angeles. He has worked with artists Sheryl Crow, Ricki Lee Jones, Glen Campbell, Scott Weiland, Slash, Velvet Revolver, Stone Temple Pilots, The Crystal Method, Tim McGraw, Cyndi Lauper, Annabella Lwin (Bow Wow Wow), Corey Glover (Living Color), Camp Freddy, DJ Hurricane and John Taylor (Duran Duran). Grean was formerly the lead guitarist and touring musical director for Scott Weiland and the Wildabouts. Some of Grean's television appearances with Weiland include: VH1 Legends, Last Call with Carson Daly, The Tonight Show with Jay Leno, and the Grammy awards with Velvet Revolver as keyboardist, performing "All Across the Universe" with Stevie Wonder, Norah Jones, Bono, Steven Tyler, Brian Wilson, and Alison Krauss.
Document 4: Kevin R. Gallagher: Kevin R. Gallagher is a guitarist who plays both the electric guitar and the classical guitar. As a classical guitarist, he has received top honors at some of the most prestigious guitar competitions in the world, including the 1993 Guitar Foundation of America, the 1994 American String Teachers Association, the 1993 Artists International Competition, and 1997 Francisco Tárrega Guitar Competition in Spain. As an electric guitarist, he is known for transcribing violin music for electric guitar and for founding the avant-rock ensemble Electric Kompany. He has also produced, in cooperation with John Zorn, a music festival titled "Full Force: The New Rock Complexity" that showcases bands that have combined styles such as classical, rock, jazz, and metal. He has produced a CD for Naxos Records titled "Guitar Recital - Music from the Renaissance and Baroque," a duo CD with Antigoni Goni titled "Evocacion," and an EP featuring his work on solo electric guitar and with Electric Kompany.
Document 5: Native Window (album): Native Window is the self-titled debut album of American progressive rock band Native Window. It was released on June 23, 2009. The tracks on the album are all original material composed by the members of the band. The album came about soon after the band formed; it was because Steve Walsh, the lead singer for Kansas, would not write any new material. Phil Ehart, Rich Williams, Billy Greer, and David Ragsdale got together to write new songs, and released them under the Native Window name.
Document 6: David Long (mandolin player): David Long is a mandolin player from Nashville, Tennessee. He was born in the winter of 1975. Long has been described as a next generation musician with traditional sounds of bluegrass. Long's music career started in 1996. He plays Rural Country Blues, Old Time Bluegrass,and Early Black String Band. David’s style of playing was influenced by Curly Seckler. David has played with the Wildwood Valley Boys for about two years, and with Karl Shiflett and his Big Show. Famously used explicit language on the stage of the World Famous Station Inn. This act merely brings the new generation to old time music ad infinitum.
Document 7: Somewhere to Elsewhere: Somewhere to Elsewhere is the fourteenth studio album by American rock band Kansas, released in 2000. It was the band's last studio album until the announcement of their 2016 album, The Prelude Implicit. This album marks the reunion of the band's original 1970s lineup since 1980's Audio-Visions, along with Billy Greer, who joined Kansas with "Power". Kerry Livgren composed all of the album's tracks, and he sings (which he does not normally do) on the hidden track "Geodesic Dome".
Document 8: David Ragsdale: David Lasater Ragsdale, (born April 3, 1958) has been the violinist for Kansas from 1991 to 1997 and from 2006 to the present. He started violin at the age of three. After studies with classical teachers and a stint at the Tulsa Philharmonic, Ragsdale's violinist duties took him out of the largely classical area and into rock and roll.
Document 9: Billy Greer: Billy Greer (born January 26, 1952) is the current bass guitarist for the band Kansas. He joined the band in 1985 in time for the Power album. He had previously worked with keyboardist/vocalist Steve Walsh in the band Streets, and works with his own band Seventh Key when not performing with Kansas. He also was a member of the brief 2009 Kansas side project "Native Window" along with Kansas members Phil Ehart, Richard Williams, and David Ragsdale.
Document 10: David Rokeach: David Rokeach has been working primarily in the San Francisco and Los Angeles areas for more than 30 years. David toured nationally and internationally with Ray Charles from 1990 to 1991. This included concert videos and many television appearances, including an appearance on "The Tonight Show Starring Johnny Carson" and the Doc Severinsen Orchestra. In recent years he has performed/recorded with Patti LaBelle, Aaron Neville, Mavis Staples, Lou Rawls, Grammy winner Joe Henderson, "Down Beat" Poll winner Mark Murphy, Bluesman Charlie Musselwhite, The George Brooks-Zakir Hussain Group, Wilson Pickett, Linda Tillery, Steve Miller, Joe Satriani, Joyce Cooling, Maria Muldaur, Calvin Keys, Barry Finnerty, Merl Saunders, David Grisman, Melvin Seals, The Rubinoos, The Family Stone Experience, Louis Bellson, Wayne Wallace, The Nelson Riddle Orchestra, Paula West, Brazilian master Marcos Silva, Bluegrass Grammy winner Alison Brown, Ernestine Anderson, Oscar Brown Jr., award-winning trumpeter Ingrid Jensen, acclaimed composer and Grammy winner, Maria Schneider, composer and pianist Brian Kelly, and many more.
Document 11: Seventh Key: Seventh Key is an American rock band formed by Mike Slamer of City Boy and Streets and Billy Greer of Streets and Kansas. The current lineup consists of Greer on bass and lead vocals, Slamer on guitar, bass, and keyboard, Pat McDonald on drums, David Manion on keyboard, and Terry Brock on guitar and backing vocals. The band had two previous drummers, Chet Wynd (2001) and Jamie Thompson (2004), as well as guest appearances by David Ragsdale of Kansas on the violin (2005) and Johnny Greer on the mandolin (2005).
Document 12: Violinski: Violinski was a rock band formed in 1977 by Electric Light Orchestra member Mik Kaminski on violins, and former member Mike de Albuquerque on guitar and vocals; plus Barry Dunnery (formerly of Necromandus), John Hodgson (drums), Paul Mann, John Marcangelo (keyboards) and Iain Whitmore (bass guitar and vocals), formerly with Starry Eyed And Laughing. At one point, former Wizzard member Bob Brady was lead vocalist, and Rod Butler, who played lead guitar for a while, also appeared on the BBC show, "Top of the Pops". At the time Kaminski was still a member of the Electric Light Orchestra, who were then enjoying their greatest success. John Hodgson had been a member of Rick Wakeman's band, the English Rock Ensemble, performing on percussion. He appeared on "The Myths and Legends of King Arthur and the Knights of the Round Table" and "Lisztomania" albums. He toured with Wakeman to North and South America, Japan, Australia and New Zealand during the period 1974-1976.
Document 13: 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 14: Greg Chaisson: Greg Chaisson is a bass guitarist, singer, songwriter, and producer who has played in various bands, most notably Badlands (which featured guitarist Jake E. Lee, formerly of Ozzy Osbourne, vocalist Ray Gillen, and drummers Eric Singer and Jeff Martin) and he also played in Jake E. Lee's Red Dragon Cartel. He has also played and recorded with Surgical Steel, Steeler, Legs Diamond, Blindside Blues Band, Die Happy, Red Sea, Pat Travers, and Darrell Mansfield among others. He resides in Phoenix, Arizona, with his wife and children where he coaches and teaches baseball and manages Bizarre Guitar & Drum. Additionally, he plays in an original band named Kings of Dust which features members Michael Beck (vocals), Ryan McKay (guitar), and Jimi Taft (drums). In 1994, he released a solo album titled "It's About Time".
Document 15: Ricky Skaggs: Rickie Lee Skaggs (born July 18, 1954), known professionally as Ricky Skaggs, is an American country and bluegrass singer, musician, producer, and composer. He primarily plays mandolin; however, he also plays fiddle, guitar, mandocaster and banjo.
ground_truth: Kansas