Question: What is the country of citizenship of the American singer playing the character of the performer of The House of Atreus Act II?

full_context: Document 1: Wish I Had an Angel: ``Wish I Had An Angel ''is the eleventh single for Finnish symphonic metal band Nightwish, the second from their fifth album Once. The song features vocals by then - vocalist Tarja Turunen and bassist Marco Hietala. The song was still performed live after Turunen's departure with Anette Olzon, before her departure, and current vocalist Floor Jansen afterwards. Featured on the soundtrack of the film Alone In The Dark, it became the group's most popular single in Europe and in the United States, next to Nemo. It made it onto two U.S. film soundtracks. It reached # 60 in the UK Singles Chart, the highest of any of the band's singles in the UK.
Document 2: The House of Atreus Act II: The House of Atreus Act II, released in 2000, is the tenth studio album by the American heavy metal band Virgin Steele. It was released as a double CD album. This album is the second and final part of a metal opera inspired by the Oresteia, a trilogy of Greek tragedies written by Aeschylus which concerns the end of the curse on the House of Atreus. The music was intended to be the soundtrack for theatrical shows, with actors impersonating the characters of the tragedy. The metal opera was actually performed under the name "Klytaimnestra - The House Of Atreus" in European theatres from 1999 to 2001, with the production of the Memmingen Opera House company and Landestheater Production.
Document 3: This Will Be the Death of Us: The album was produced by Mike Green (Paramore, The Matches) and is their debut on Epitaph Records after their manager reportedly paid their previous label, Eulogy Recordings, to buy out their contract. Recording was completed in late March. The album features various guest vocals including Vinnie Caruana of I Am the Avalanche and The Movielife on opener and title track, "This Will Be the Death of Us". Hayley Williams of Paramore also features on "The Few That Remain", whilst ex-vocalist of Turmoil Jon Gula is featured on "Gaia Bleeds (Make Way For Man)". The album is closed with the 90s skate punk influenced "Our Ethos: A Legacy to Pass On", featuring vocals from New Found Glory’s Chad Gilbert. Jordan Pundik, also of New Found Glory provides vocals on the Japanese bonus track "The Lost Boys".
Document 4: David DeFeis: David DeFeis (born January 4, 1961) is an American singer, keyboard player, songwriter and producer. He is the main composer and leader of the heavy metal band Virgin Steele.
Document 5: The Black Light Bacchanalia: The Black Light Bacchanalia is the twelfth album by New York heavy/power metal group Virgin Steele, released via SPV/Steamhammer on October 22, 2010 in Germany, Austria & Switzerland, and the rest of Europe on October 25, 2010 & on November 9, 2010, in the USA.
Document 6: Atys (Piccinni): In 1783 there was a second version of the opera produced by Piccinni and Marmontel. In order to satisfy the current trends in opera, they changed the ending to a "lieto fine", or happy ending, by rewriting entire sections of the original opera. In this second version "Atys" was returned to the stage of the Opéra in 1783, 1784, 1791 and 1792. In all, it was mounted at the Opéra on 65 dates before being dropped for good.
Document 7: Lamborghini Angels: "Lamborghini Angels" is a song performed by rapper Lupe Fiasco. It was released on August 14, 2012 as the third single from his forthcoming album "". The song contains lyrics that may offend people because of its religious content.
Document 8: Don Randi: Don Randi (born 25 February 1937) is an American keyboard player, bandleader and songwriter. He has performed on innumerable recordings, including many as a session musician and member of the Wrecking Crew, as well as releasing his own jazz records.
Document 9: The House of Atreus Act I: The House of Atreus Act I, released in 1999, is the ninth studio album by the American heavy metal band Virgin Steele. It has the subtitle "A Barbaric-Romantic Opera". This album is the first part of a metal opera inspired by the Oresteia, a trilogy of Greek tragedies written by Aeschylus which concerns the end of the curse on the House of Atreus. The music was intended to be the soundtrack for theatrical shows, with actors impersonating the characters of the tragedy. The metal opera was actually performed under the name "Klytaimnestra - The House Of Atreus" in European theatres from 1999 to 2001, with the production of the Memmingen Opera House company and Landestheater Production.
Document 10: Steve Hunter: Stephen John Hunter (born June 14, 1948) is an American guitarist, primarily a session player. He has worked with Lou Reed and Alice Cooper and been often called ``The Deacon ''. Hunter first played with Mitch Ryder's Detroit, beginning a long association with record producer Bob Ezrin who has said Steve Hunter has contributed so much to rock music in general that he truly deserves the designation of`` Guitar Hero''. Steve Hunter has played some of the greatest riffs in rock history - that first slamming solo that rings in Aerosmith's ``Train Kept A Rollin ''', the acoustic intro on Peter Gabriel's`` Solsbury Hill'' and he wrote the legendary intro interlude that made Lou Reed's live version of ``Sweet Jane ''Reed's first gold record (the Rock' N 'Roll Animal live set).
Document 11: David Briggs (American musician): David Paul Briggs (born March 16, 1943 in Killen, Alabama, United States) is an American keyboardist, record producer, arranger, composer and studio owner. Briggs is one of an elite core of Nashville studio musicians known as "the Nashville Cats" and has been featured in a major exhibition by the Country Music Hall of Fame in 2015. He played his first recording session at the age of 14 and has gone on to add keyboards to a plethora of pop, rock, and country artists, as well as recording hundreds of corporate commercials.
Document 12: David Wise (composer): David Wise is an English video game music composer and musician. He was a composer at Rare from 1985 to 2009, and was the company's sole musician up until 1994. He has gained a cult following for his work on various games, particularly Nintendo's Donkey Kong Country series. Wise is known for his atmospheric style of music, mixing natural environmental sounds with prominent melodic and percussive accompaniment.
Document 13: Irene Jansen: Irene Jansen is a Dutch singer. She sang on the Ayreon album "The Human Equation", portraying the character Passion. She was also the live backing vocalist of Star One during their tour in 2003, and played the character Morgana in two Gary Hughes concept albums. She was the lead singer of a power metal band called Karma. She made her first recordings in more than a decade for the Alarion album "Waves of Destruction", released in 2016.
Document 14: Angels of the Apocalypse: As with the previous effort, several heavy metal singers were invited to play the characters of the story of the album, with female vocalist Elize Ryd of Amaranthe reprising her role and Floor Jansen (Nightwish, ReVamp) playing the main character. The rest of the cast includes Fabio Lione (Rhapsody of Fire, Angra), David DeFeis (Virgin Steele), Simone Simons (Epica), Caterina Nix (solo Chilean singer who is having her debut album produced by Timo Tolkki) and Zachary Stevens (ex-Savatage, Circle II Circle).
Document 15: Atlas (opera): Atlas is an opera in three acts composed by Meredith Monk who also wrote the libretto and choreographed the dances. It is scored for 18 voices and a small chamber orchestra which includes a shawm and a glass harmonica. The story is very loosely based on the life and writings of the explorer Alexandra David-Néel and is told primarily through wordless vocal sounds with brief interjections of spoken text in Mandarin Chinese and English. The opera was co-commissioned by Houston Grand Opera, the Walker Art Center in Minneapolis, and the American Music Theater Festival in Philadelphia. It premiered at Houston Grand Opera in February 1991, followed by performances that same year in Philadelphia and Minneapolis. It subsequently toured in the US and Europe and had its New York premiere in May 1992 at the Brooklyn Academy of Music.
ground_truth: America
sub_queries: The House of Atreus Act II >> performer Answer: Virgin Steele
Virgin Steele >> has part Answer: David DeFeis
David DeFeis >> country of citizenship Answer: America