Question: Burton C. Bell and Tommy Shaw, have which nationality?

Context paragraphs:
Descent (song): "Descent" is a single by American heavy metal band Fear Factory from their album "Obsolete".  It was the third single released and the fifth track on the album.  The music was composed by guitarist Dino Cazares and drummer Raymond Herrera, with lyrics by Burton C. Bell.  In the storyline of "Obsolete's" concept, "Descent" expresses the despair felt by the album's protagonist, the dissident Edgecrusher, as he rests briefly on his flight from the pursuing forces of Securitron.  He questions the worth of his personal mission; in the end, he decides to continue his fight against his oppressors.

Tommy Shaw: Tommy Roland Shaw (born September 11, 1953) is an American guitarist, singer, songwriter, and performer best known for his work with the rock band Styx.  In between his stints with Styx, he has played with other groups including Damn Yankees, Shaw Blades as well as releasing several solo albums.

Shock (Fear Factory song): "Shock" is a song by American heavy metal band Fear Factory.  It was the lead single from their 1998 album "Obsolete" and the first track on the album.  Its music was composed by guitarist Dino Cazares and drummer Raymond Herrera.  The lyrics were written by vocalist Burton C. Bell.  The introduction of a concept album, "Shock" introduces its protagonist, a political prisoner known only as Edgecrusher, who declares his personal mission to destroy the totalitarian society in which he lives.

Demanufacture (album): Demanufacture is the second studio album by American industrial metal band Fear Factory, released on June 13, 1995 by Roadrunner Records.  Burton C. Bell wrote a majority of the lyrics and Dino Cazares wrote all the music.  This is the band's first album with their classic line-up adding new bassist Christian Olde Wolbers.  Although credited as Fear Factory's official bassist, Christian Olde Wolbers only played live.  Many regard it as the band's best album and a heavy metal classic.  The album was certified Gold in Australia by ARIA and Silver in the UK by the BPI.

Clark Brown: Clark Ernst Brown is the vocalist for GZR.  He took over from Burton C. Bell, who had guested on "Plastic Planet" (1995) and has remained since.  Clark is also the vocalist for SYMATIC, a Hardcore Metal band out of Massachusetts.

Shaw Blades: Shaw–Blades is an American musical duo/group formed by Tommy Shaw of Styx and Jack Blades of Night Ranger, both of whom played in the supergroup Damn Yankees.  It is an informal duo which has produced two albums between other projects, 1995s "Hallucination" and 2007s "Influence".  The first two songs on "Hallucination" -- "My Hallucination" and "I'll Always Be with You"—received modest airplay.  "Influence" consisted solely of 1960s and 1970s cover songs that influenced them.  Blades' son Colin, an experimental songwriter himself, contributed backing vocals and arrangements to the album.  Shaw-Blades also recorded a cover of the classic Christmas song "The Twelve Days of Christmas" on the "A Classic Rock Christmas" album by various classic rock artists in 2002.  Shaw–Blades did a short tour of America in Spring 2007 and another in Autumn 2007.  Both members still principally record and perform with the acts which made them famous.

Digimortal (album): Digimortal is the fourth studio album by American industrial metal band Fear Factory, released on April 24, 2001 by Roadrunner Records.  It is a concept album and a sequel to "Obsolete", their previous album (which was a continuation to "Demanufacture") and the final part of a trilogy.  This was the band's last album before officially breaking up in March 2002.  Although "Digimortal" was not a commercial success, this was not given as reason for the band's breakup, instead citing frontman Burton C. Bell's desire to "form a band that's more indie-rock-oriented."  Fear Factory would officially reform in 2003, however, to begin work on their next album, "Archetype".  "Digimortal" was the last to feature founding guitarist/songwriter Dino Cazares for eight years until his return to the band in 2009.

Mechanize: Mechanize is the seventh studio album by American heavy metal band Fear Factory.  It is the only album to feature Gene Hoglan on drums and the first since 2001's "Digimortal" to include original guitarist and founding member Dino Cazares, who rejoined the band after a reconciliation with lead vocalist Burton C. Bell, in April 2009.  The album was produced by Rhys Fulber, who had not produced or been involved with a Fear Factory album since "Archetype".  The album has received mostly positive reviews from fans and music critics, being praised for its very aggressive and heavy sound.  In its first week of release, the album sold 10,000 copies.

City of Fire (band): City of Fire is a groove metal band from Canada, formed in 2008.  Members include vocalist Burton C. Bell of Fear Factory, bassist Byron Stroud from Fear Factory, Strapping Young Lad and Zimmers Hole, and drummer Bob Wagner of Econoline Crush.  City of Fire has so far released a self-titled album, issued in Australia in April 2010 and worldwide in August.  The second pressing of the album contained additional "bonus tracks", one of which was a cover of the T-Rex song "Children of the Revolution".  Several poorly recorded sample portions of their songs were uploaded on the band's MySpace page throughout 2009, often accompanied with video (consisting mostly of studio footage).

Burton C. Bell: Burton Christopher Bell (born February 19, 1969) is an American musician and vocalist.  Bell is best known as co-founder and frontman of the metal band Fear Factory.  His singing style mixes clean and shouted vocals with death growls.

Supporting paragraphs: Burton C. Bell Tommy Shaw
Answer: American