Question: What Canadian vocalist was featured in a guest appearance on the album Haven by Kamelot?
Context: Alissa White-Gluz ( ; born July 31, 1985) is a Canadian vocalist, best known as lead vocalist of the Swedish melodic death metal band Arch Enemy, and former lead vocalist and founding member of the Canadian metal band The Agonist. The Black Halo is the highly acclaimed, seventh full-length album by the American power metal band Kamelot.  It was released on March 15, 2005, through Steamhammer Records.  It is a concept album inspired by Goethe's Faust.  Continuing the story introduced in "Epica" (2003), it is the second and final record in Kamelot's two-part rock opera about Ariel (a character based on Heinrich Faust).  Epica tells Part 1 while The Black Halo tells Part 2.  Goethe's Faust is also broken into two parts.  The Black Halo features guest appearances by Simone Simons (Epica), Shagrath (Dimmu Borgir), Jens Johansson (Stratovarius), and several others.  The album was released on vinyl in the spring of 2009, along with "Ghost Opera" (2007). Amy Berg grew up in Castro Valley, California, USA.  She is an American TV writer and showrunner, known best for her work on "Counterpart", "Da Vinci's Demons", "Person of Interest", "Eureka", "Leverage", and "The 4400".  Her other television credits include "Boomtown" and "Threshold".  She was also a featured performer at w00tstock 3.0 during San Diego Comic Con in 2011.  In September 2011, she made a guest appearance as herself in an episode of "Eureka" guest star Felicia Day's web series "The Guild".  Similarly, in May 2013 she made a guest appearance as herself in an episode of "Eureka" and "Leverage" guest star Wil Wheaton's web series "TableTop". Consign to Oblivion is the second studio album by Dutch symphonic metal band Epica, and was released in 2005.  The song "Trois Vierges" features a guest appearance by then Kamelot vocalist Roy Khan.  The album's lyrics are inspired by the Maya civilization.  The CD was released with copy control on it.  This CD started a new collection of songs, called "A New Age Dawns".  This saga is continued on the album "Design Your Universe". Haven is the eleventh studio album by the American power metal band Kamelot.  The album is produced by Sascha Paeth and mastered by Jacob Hansen.  The cover and artwork were created by Stefan Heilemann and the additional art/layout were done by Gustavo Sazes.  It features guest appearances by Alissa White-Gluz (Arch Enemy), Troy Donockley (Nightwish) and Charlotte Wessels (Delain). Crazy Love is the sixth studio album (and fourth major label studio album) by Canadian vocalist Michael Bublé.  It was released through 143 Records and Reprise Records on October 9, 2009.  After only three days of sales, it opened atop the "Billboard" 200 chart with 132,000 copies, making it Bublé's second No. 1 album.  Spending the first full week at the top, the album increased in sales to 203,000 copies, staying again at the No. 1 spot on its second week.  In Australia, the album debuted at No. 1 on the ARIA Albums Chart and spent six non-consecutive weeks as No. 1.  It has since been certified five times Platinum.  In the United Kingdom, "Crazy Love" topped the album charts. In show business, a guest appearance is the participation of an outsider performer (such as a musician or actor) in an event such as a music record or concert, show, etc., when the performer does not belong to the regular cast, band or other performing group.  In music, such an outside performer is often referred to as a guest artist.  In performance art, the terms guest role or guest star are also common, the latter term specifically indicating the guest appearance of a celebrity.  The latter is often also credited as "special guest star" or "special musical guest star" by some production companies. To Be Loved is the eighth studio album and sixth major label studio album by Canadian vocalist and songwriter Michael Bublé.  The album was released in the United Kingdom on April 15, 2013, before issuing in Canada on April 22 and the United States on April 23.  The album was preceded by the release of the lead single, the original composition "It's a Beautiful Day", released on February 25, 2013.  The album features four original songs and ten cover versions.  The album has approximately sold over 4,5 million copies worldwide. Hunter Siegel, is a Canadian DJ and music producer.  Hunter made his first appearance with his debut single, released independently, Waiting Up, which was released in white label format in June 2013.  Hunter received international support with Waiting Up and quickly caught the ear of a number of tastemaker labels, like Steve Angello's Size Records where he did a release with house music legend Todd Terry.  In 2015, Hunter released his first record with Atlantic's dance label Big Beat Records, titled Let Me Love You Right, which featured Canadian vocalist Kai.  The record received immediate support on radio throughout North America.  Hunter and BigBeat then followed up with the music video which was an ode to the wildly popular movie "Fight Club" as noted in the Billboard Magazine world premier.  Since 2015, Hunter has appeared in numerous international music festivals like HARD SUMMER MUSIC FEST Electric Zoo Music Festival in New York City and Splash House in Palm Springs, California.  Hunter Siegel is also the creator of the international brand #NoNeon which launched in January 2014 out of Toronto and has since spread south all the way to Florida. Kamelot is an American power metal band from Tampa, Florida, formed by Thomas Youngblood and Richard Warner in 1991.  The Norwegian vocalist Roy Khan joined for the album "Siége Perilous", and shared songwriting credit with Youngblood until his departure in April 2011.  On June 22, 2012, Youngblood announced on their website that their new vocalist is the Swedish singer Tommy Karevik, who was first featured on Kamelot's album "Silverthorn" as main vocalist, co-songwriter and lyricist.
Answer: Alissa White-Gluz