Question: Are David Vincent and Cerys Matthews both American?

Context articles: Cerys Matthews
Catatonia Greatest Hits
Jeff Irwin
Mulder and Scully (song)
Never Said Goodbye
David Vincent
Larry Adler
Road Rage (Catatonia song)
Game On (song)
Catatonia (band)

Cerys Elizabeth Matthews, MBE ( ; born 11 April 1969) is a Welsh singer, songwriter, author, and broadcaster.
 She was a founding member of Welsh rock band Catatonia and a leading figure in the "Cool Cymru" movement of the late 1990s.
Catatonia's Greatest Hits is a compilation of the band's best known songs, mainly the singles, but also included collaborations between Cerys Matthews with Space (on "The Ballad of Tom Jones") and with Tom Jones himself (on "Baby, It's Cold Outside").
Jeff Irwin (a.k.a. "the Yeti", born September 12, 1977) is an American, East Nashville, Tennessee based multi-instrumentalist.
 He has performed with Griffin House, Cerys Matthews, Derek Webb and Sandra McCracken, Mat Kearney, Taylor Sorensen & the Trigger Code, and many others including Counting Crows.
"Mulder and Scully" is a song by Catatonia, released as a single from their 1998 album, "International Velvet".
 The song makes direct reference to fictional FBI special agents Fox Mulder (David Duchovny) and Dana Scully (Gillian Anderson), the two main characters of the popular sci-fi TV series "The X-Files" who work on cases linked to the paranormal, called X-Files.
 In an interview Cerys Matthews, co-writer of the song, explained that while she was not a serious fan of the show, the basic premise of the series matched the conceit of what she was trying to express.
Never Said Goodbye is the second solo studio album by Welsh singer-songwriter Cerys Matthews.
 It was released on 21 August 2006 by Rough Trade Records.
David Justin Vincent (born April 22, 1965), also known as Evil D, is an American musician who is best known as the former lead vocalist and bassist for the death metal band Morbid Angel as well as the bassist for Genitorturers.
 His early influences are Kiss and Alice Cooper.
Lawrence "Larry" Cecil Adler (February 10, 1914 – August 6, 2001) was an American musician, one of the world's most skilled harmonica players.
 Ralph Vaughan Williams, Malcolm Arnold, Darius Milhaud and Arthur Benjamin composed for him.
 During his later career he collaborated with Sting, Elton John, Kate Bush and Cerys Matthews.
"Road Rage" is a song recorded by the Welsh band Catatonia, taken from their second studio album, "International Velvet".
 It was written by band member Mark Roberts, with the production credit given generally to the band.
 "Road Rage" was released as the third single from the album, following their break-out success with the song "Mulder and Scully".
 The title "Road Rage" was based on the murder of Lee Harvey by his girlfriend Tracie Andrews in December 1996, something for which singer Cerys Matthews later apologised to Harvey's mother.
"Game On" is a song recorded by the Welsh band Catatonia, taken from their second studio album, "International Velvet".
 It was written by band members Cerys Matthews and Mark Roberts, and produced by TommyD and the band generally.
 Commercially, the song only charted in the UK Singles Chart, peaking at number 33.
Catatonia were an alternative rock band from Wales who gained popularity in the mid- to late 1990s.
 The band formed in 1992 after Mark Roberts met Cerys Matthews.
 The first major lineup featured Dafydd Ieuan on drums, Clancy Pegg on keyboard, Owen Powell on guitar and Paul Jones on bass.
 They recorded two EPs, "For Tinkerbell" and "Hooked".