Question: In what band was the Canadian featured on vocals in Unweaving the Rainbow the lead singer?
Context: Bleeding Rainbow was a Philadelphia-based band that was originally composed of singer/bassist Sarah Everton - also the drummer when they played as Reading Rainbow - and singer/guitarist Rob Garcia, though the group was expanded to include drummer Greg Frantz and lead guitarist Al Creedon.  While still performing as a duo, Everton and Garcia released two full-length albums under the name Reading Rainbow, "Mystical Participation", and "Prism Eyes" on HoZac Records.  The band's third release and their first under their new moniker, Restless Heart is an American country music band established in 1984.  The band's longest-lasting lineup has consisted of Larry Stewart (lead vocals), John Dittrich (drums, background vocals), Paul Gregg (bass guitar, background vocals), Dave Innis (piano, keyboards, rhythm guitar, background vocals), and Greg Jennings (lead guitar, mandolin, background vocals).  Verlon Thompson was the band's original lead singer, but he was replaced by Stewart before the band signed to RCA Records Nashville.  Stewart departed for a solo career in 1992; during this time, Innis, Gregg, and Dittrich alternated as lead vocalists, until Innis also left.  The band was on hiatus from 1994 to 1998.  During this hiatus, Dittrich briefly recorded as one-third of The Buffalo Club, and Jennings joined Vince Gill's road band.  Stewart, Gregg, Dittrich, and Jennings reunited briefly in 1998 to record new material for a greatest hits album; they, along with Innis, reunited again in 2004, and this lineup has remained ever since. Rainbow (also known as Ritchie Blackmore's Rainbow or Blackmore's Rainbow) are a British rock band led by guitarist Ritchie Blackmore, active from 1975 to 1984, from 1993 to 1997, and from 2015 to the present.  They were originally established with Ronnie James Dio's American rock band Elf, but after their first album, Blackmore fired the backing members and continued with Dio until 1979.  Three British musicians joined in 1979, singer Graham Bonnet, keyboardist Don Airey, former Deep Purple bassist Roger Glover, and this line-up gave the band their commercial breakthrough with the single "Since You Been Gone".  Over the years Rainbow went through many line-up changes with no two studio albums featuring the same line-up.  Other lead singers Joe Lynn Turner and Doogie White would follow, and the project consisted of numerous backing musicians.  A pioneer to power metal, the band's early work primarily featured mystical lyrics with a neoclassical metal style, but went in a more streamlined, commercial direction following Dio's departure from the group. Kevin James LaBrie (born May 5, 1963) is a Canadian vocalist and songwriter, who is best known as the lead singer of the American progressive metal band Dream Theater. Adolf "Dado" Topić (born 4 September 1949, Siverić) is a rock musician from Croatia and the former Yugoslavia.  He was the lead singer and founder of Time, a 1970s progressive rock band.  From 1970 to late 1971, he was also the lead singer of the popular prog-rock band Korni Grupa (also known as The Kornelyans).  He is a rock musician from Croatia and the former Yugoslavia.  He was the lead singer and founder of Time, a 1970s progressive rock band.  From 1970 to late 1971, he was also the lead singer of the popular prog-rock band Korni Grupa (also known as The Kornelyans).  He is a male vocalist who sang the entry from Croatia in the Eurovision Song Contest 2007, together with the band Dragonfly. The lead vocalist, main vocalist, lead vocals or lead singer in popular music is typically the member of a group or band whose voice is the most prominent in a performance where multiple voices may be heard.  The lead singer either leads the vocal ensemble, or sets against the ensemble as the dominant sound.  In vocal group performances, notably in soul and gospel music, and early rock and roll, the lead singer takes the main vocal part, with a chorus provided by other band members as backing vocalists. Unweaving the Rainbow is a 2003 concept album by Frameshift, featuring James LaBrie on vocals. Shenandoah is an American country music group founded in Muscle Shoals, Alabama in 1984 by Marty Raybon (lead vocals, acoustic guitar), Ralph Ezell (bass guitar, backing vocals), Stan Thorn (keyboards, backing vocals), Jim Seales (lead guitar, backing vocals), and Mike McGuire (drums, background vocals).  Thorn and Ezell left the band in the mid-1990s, with Rocky Thacker taking over on bass guitar; Keyboardist Stan Munsey joined the line up in 1995.  The band split up in 1997 after Raybon left.  Seales, Munsey, Thacker and McGuire reformed the band in 2000 with lead singer Brent Lamb, who was in turn replaced by Curtis Wright and then by Jimmy Yeary.  Ezell rejoined in the early 2000s, and after his 2007 death, he was replaced by Mike Folsom.  Raybon returned to the band in 2014.  That same year, Jamie Michael replaced the retiring Jim Seales on lead guitar. Rockaholic is the eighth studio album by American rock band Warrant, released on May 17, 2011.  The album features the band's third lead singer, Robert Mason, who replaced original lead singer Jani Lane in 2008.  Lane returned to the band for a 2008 reunion tour but by the end of the year, he and the band parted ways for the second time.  Lane had previously replaced former lead singer Jaime St. James, who performed lead vocals on the band's last album, "Born Again", and who initially replaced Lane in 2004. Joe Lynn Turner (born Joseph Arthur Mark Linquito, August 2, 1951) is an American singer, guitarist, songwriter, and producer.  He is known for his work in the hard rock bands Rainbow and Deep Purple.  During his career, Turner fronted and played guitar with pop rock band Fandango in the late 1970s; and in the early 80s, he became a member of Rainbow, fronting the band and writing songs with guitarist, Ritchie Blackmore and bassist, and producer, Roger Glover.  After Rainbow had disbanded (the first time) in March 1984, he pursued a solo career, released one album, Rescue You, and then later did session work, singing background vocals for the likes of Billy Joel, Cher, and Michael Bolton.  On the advice of Bolton, Turner began recording jingles for radio and television.  Other songs he had composed or through collaboration with songwriters like Desmond Child and Jack Ponti were being recorded and released by international recording artists Jimmy Barnes, Lee Aaron, and Bonfire.  Turner had a short-lived association with neoclassical metal guitarist Yngwie Malmsteen and then Deep Purple.  From the mid-1990s, he resumed his solo career, releasing an additional nine studio and two live recordings.  Turner did other session work, appearing as lead vocalist on tribute albums and working on projects involving various musical groups including progressive rock band Mother's Army; Bulgarian hard rock band Brazen Abbot; funk rock duo Hughes Turner Project; and classic rock/ progressive rock band Rated X.  In 2006, Frontiers Records approached Turner to become involved with the AOR side project Sunstorm.  By 2016, four albums under the Sunstorm name had been released.  That same year, Turner released "The Sessions" via Cleopatra Records featuring a veritable who's who of classic rock royalty as guest musicians, before resuming his seemingly constant touring schedule back in Europe
Answer: Dream Theater