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?

Context articles: X-Sinner
Somewhere to Elsewhere
David Ragsdale
Seventh Key
Marco Hietala
Native Window (album)
Ricky Phillips
Hugh McDonald (American musician)
Dave Hope
Billy Greer

X-Sinner is an American hard rock band formed in 1988 by guitarist Greg Bishop.
 The band is known for having a very similar sound to that of AC/DC, Kix and Def Leppard and has continued performing and releasing albums today.
 Originating in the White Metal scene, the band has expanded their fan base into mainstream metal over the years with great success.
 They were named the favorite new band of 1989 by the readers of "HM Magazine", and their debut album "Get It" was one of the most talked about albums within the white metal scene at the time.
 Their first two albums were produced by John Elefante formerly of the band Kansas and released on Pakaderm Records, as well as on the mainstream A&M Records label of Hollywood.
 They have released five full-length albums including the latest album "A World Covered In Blood" now on Image Records.
 Experiencing a resurgence of interest with the release of "World Covered In Blood" in 2009/10, the band has gone on to perform in Europe recently as well as concerts in the U.S. and Canada.
 The band has opened for many mainstream metal artists like Warrant and Paul Dianno as well as headlining and performing at rock festivals and performing concerts of their own.
 The band has united with members of Rex's new side project GX for their live performances recently and have added that material to their live set list.
 X-Sinner's album, "Going Out With a Bang", will be released track by track starting in 2014.
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".
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.
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).
Marko Tapani "Marco" Hietala (born 14 January 1966) is a Finnish heavy metal vocalist, bass guitarist and songwriter.
 Internationally, he is most known as the current bass guitarist, male vocalist and secondary composer to Tuomas Holopainen, of the symphonic metal band Nightwish.
 He is also the vocalist and bassist as well as composer and lyricist for the heavy metal band Tarot.
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.
Ricky Lynn Phillips (born October 7, 1952) is an American bass guitarist and the current bass player for the rock band Styx.
 He has also played in Nasty Habit, as a member of The Babys and Bad English, and with Coverdale-Page and Ted Nugent.
Hugh John McDonald (born December 28, 1950) is an American musician who is best known for his session work and for being the current bass guitarist of the American rock band Bon Jovi, whom he joined as an unofficial member in November 1994, not becoming an official member until 2016.
 He made his recording debut as a session musician for The Deirdre Wilson Tabac self-titled album in 1969.
 Before joining Bon Jovi he was the bass guitarist for the David Bromberg Band, touring extensively worldwide and playing on many Bromberg albums.
 He has played with many other artists, both live and in the studio, and has recorded with Willie Nelson, Jon Bon Jovi, Richie Sambora, Steve Goodman, Ringo Starr, Lita Ford, Michael Bolton, Cher, Alice Cooper, Ricky Martin, Michael Bublé, Bret Michaels, others and did a few dates during the Shania Twain, the Woman in Me TV tour.
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.
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.