Galactic Cowboys are an American heavy metal band based in Houston, Texas.
 They combined progressive metal with a vocal style influenced by The Beatles and the heavy playing style of thrash bands such as Anthrax.
 They have been described as "possibly the most melodic metal band ever to exist in Christian or general markets."
 Although the band members are Christians, they did not consider Galactic Cowboys to be a Christian band.
Rock Star Supernova is the debut self-titled album by American hard rock supergroup Rock Star Supernova, released on November 21, 2006 through Mark Burnett Productions and Epic Records.
 The band was formed during the second season of the "Rock Star" TV series, which was called "".
 The album received mainly negative reviews and only charted at number 101 on the "Billboard" 200.
 However the album charted at #4 on the Canadian Albums Chart and was certified Platinum (over 100,000 units sold).
Rock Star is a television series produced by Mark Burnett, David Goffin, and Lisa Hennessy in which aspiring singers from all around the world competed to become the lead singer of a featured group.
 It debuted on CBS on July 11, 2005, to mediocre ratings.
 The show was hosted by television personality and commercial spokeswoman Brooke Burke and Jane's Addiction & Red Hot Chili Peppers lead guitarist Dave Navarro.
 In Australian band INXS chose J.D. Fortune as their new lead singer.
 For , the band Rock Star Supernova chose Lukas Rossi as the lead singer of their new supergroup.
Boize was a Canadian heavy metal and glam metal band based in Montreal, Quebec.
 The band was formed in the spring of 1989 in Laval, Quebec when vocalist Perry Blainey responded to an advertisement placed in the Montreal Gazette newspaper by bassist and keyboardist Stéphane Fania and guitarist Robert Kourie.
 Boize was associated with record label Aquarius Records and was managed by Canadian musician star and recording studio owner Bill Hill, under his music production company and management agency Bill Hill Productions.
 The band also had a brief association with South American heavy metal legend Alvacast, when singer Carlos "Charly" Lopez joined Boize as new vocalist in the fall of 1992.
Extrema formed in 1986 in Milan.
 The initial lineup included guitarist Tommy Massara, vocalist/guitarist Andrea Boria, bassist Luca Varisco, and drummer Stefano Bullegas.
 Regarded as one of Italy's first thrash metal bands, Extrema's first EP, "We F**kin' Care" (1987), sold an impressive 3,000 copies by word of mouth alone.
 Italian heavy metal fans didn't yet seem prepared to embrace local talent, however, and the next four years saw Extrema (by then entirely re-vamped, with Massara signing on new members Gianluca Perotti on vocals, Mattia Bigi on bass, and Chris Dalla Pellegrina on drums) relegated to open for visiting acts like Slayer, D.R.I., and Corrosion of Conformity.
 Finally realizing that their only hope of impressing local talent scouts lay in conquering from the outside-in, Extrema started aggressively shopping their demos to international heavy metal critics, and even financed a trip to New York City for a one-off gig.
 The strategy worked, and their four-track demo from 1991 was soon making waves with some major international publications, eventually leading to a record deal with Contempo Records.
 The result was the 1993's "Tension at the Seams" album, which led to stadium support slots with Italian rock star Vasco Rossi, and more importantly a high-profile metal festival appearance in Turin alongside Megadeth, The Cult, Suicidal Tendencies, and Metallica.
 The album also featured an unconventional cover of The Police's "Truth Hits Everybody" and spawned a video clip for the track "Child O' Boogaow" which was on heavy rotation on Italy's MTV affiliate, Videomusic.
Rock Star Supernova was a reality television-formed supergroup consisting of drummer Tommy Lee (Mötley Crüe), bassist Jason Newsted (ex-Metallica), guitarist Gilby Clarke (ex-Guns N' Roses) and singer Lukas Rossi.
 The band was formed during the second season of the Rock Star Reality TV series which was called .
Metallica is an American heavy metal band based in San Rafael, California.
 The band was formed in 1981 in Los Angeles when vocalist/guitarist James Hetfield responded to an advertisement posted by drummer Lars Ulrich in a local newspaper.
 Metallica's current lineup comprises founding members Hetfield and Ulrich, longtime lead guitarist Kirk Hammett, and bassist Robert Trujillo.
 Guitarist Dave Mustaine (who went on to form Megadeth) and bassists Ron McGovney, Cliff Burton, and Jason Newsted are also former members of the band.
Rock Star: Supernova is the second season of the reality television show "Rock Star".
 The show, hosted by Dave Navarro and Brooke Burke, featured 15 contestants competing to become the lead vocalist for a newly formed supergroup featuring Mötley Crüe drummer Tommy Lee, former Metallica bassist Jason Newsted, and former Guns N' Roses guitarist Gilby Clarke.
Heavy metal bass is the use of the bass guitar (also called "electric bass") in the rock music genres of heavy metal and hard rock.
 The bassist is part of the rhythm section in a heavy metal band, along with the drummer, rhythm guitarist and, in some bands, a keyboard player.
 The prominent role of the bass is key to the metal sound, and the interplay of bass and distorted electric guitar is a central element of metal.
 The bass guitar provides the low-end sound crucial to making the music "heavy".
 The bass plays a "...more important role in heavy metal than in any other genre of rock."
"Headspin" is a song by unsigned Canadian band Rise Electric, which is fronted by "" winner Lukas Rossi.
 The song was released on Rock Star Supernova's self-titled debut album.
 It was released as the third single from the album in early 2007.
 Rossi performed "Headspin" three times while on "Rock Star: Supernova".
 Following the Rock Star Supernova tour Luke Rossi released an acoustic version of the song which is featured on his album "Love & Lust".

Question: Rock Star: Supernova included the heavy metal band based out of what California city?
Answer: San Rafael