question: What nationality is the performer of song Six Strings Down?
context: [["Caspar Babypants", ["Caspar Babypants is the stage name of children's music artist Chris Ballew, who is also widely known as the singer of The Presidents of the United States of America."]], ["Honky-Tonk Man", ["\" Honky- Tonk Man\" is a song co-written and recorded by American country music singer Johnny Horton.", "It was released in March 1956 as his debut single on Columbia Records, reaching number 9 on the U.S. country singles charts.", "Horton re-released the song six years later, taking it to number 11 on the same chart."]], ["Billy Milano", ["Billy Milano is a Bronx- born heavy metal musician now based in Austin, Texas.", "He is the singer and- occasionally- guitarist and bassist of crossover thrash band M.O.D., and he was also the singer of its predecessor, Stormtroopers of Death.", "He was also the singer of United Forces, which also featured his Stormtroopers of Death bandmate Dan Lilker."]], ["Kristian Leontiou", ["Kristian Leontiou (born February 1982) is a British singer of Greek Cypriot descent, and is the singer for the indie rock band One eskimO."]], ["Jimmie Vaughan", ["Jimmie Lawrence Vaughan (born March 20, 1951, Oak Cliff, Dallas County, Texas, United States) is an American blues rock guitarist and singer based in Austin, Texas.", "He is the older brother of the late Texas blues guitarist Stevie Ray Vaughan.", "Several notable blues guitarists have had a significant influence on Vaughan's playing style including the \"Three Kings\" (Albert, Freddie, and B.B. King) and Johnny \"Guitar\" Watson."]], ["Six Strings Down", ["\"Six Strings Down\" is a blues song recorded by Jimmie Vaughan in 1994.", "It is a tribute to his brother, Stevie Ray Vaughan, who died in 1990, and the memory of other deceased guitarists.", "The song was written by Art Neville, Eric Kolb, Aaron Neville, Cyril Neville, Kelsey Smith, and Vaughan.", "It first appeared on Vaughan's album \"Strange Pleasure\", in 1994.", "The song was originally performed as an acoustic blues.", "The opening line, \"Alpine Valley, in the middle of the night\", refers to the Alpine Valley Music Theater, near East\nTroy, Wisconsin, where the helicopter carrying Stevie Ray Vaughan and several others crashed following a concert in 1990.", "The song also mentions several other deceased blues guitarists: Jimi Hendrix (as the \"voodoo chile\"), Albert Collins, Muddy Waters, and Lightnin' Hopkins.", "Its refrain includes the lyric \"Heaven done called another blues stringer back home\".", "Later versions of the song have been performed as electric blues with accompaniment.", "Live recordings include a 1996 tribute concert to Stevie Ray Vaughan, with Jimmie Vaughan, Eric Clapton, B.B. King, Robert Cray, Dr. John, Bonnie Raitt, Art Neville and Buddy Guy.", "Vaughan, Clapton, and others performed it at the Crossroads Guitar Festival in 2004 and again in 2010 by Vaughan, Clapton, Robert Cray and Hubert Sumlin."]], ["D\u00e1ith\u00ed Sproule", ["D\u00e1ith\u00ed Sproule( born 23 May 1950) is a guitarist and singer of traditional Irish music.", "His niece is the singer Claire Sproule."]], ["O Valencia!", ["\" O Valencia!\" is the fifth single by the indie rock band", "The Decemberists, and the first released from their fourth studio album,\" The Crane Wife\".", "The music was written by The Decemberists and the lyrics by Colin Meloy.", "It tells a story of two star- crossed lovers.", "The singer falls in love with a person who belongs to an opposing gang.", "At the end of the song, the singer's lover jumps in to defend the singer, who is confronting his lover's brother( the singer's\" sworn enemy\") and is killed by the bullet intended for the singer."]], ["Panda (Astro song)", ["\" Panda\" is a song of the Chilean band Astro and is the fifth song of the homonymous album of the year 2011.", "The song was composed and produced by the singer of the band Andr\u00e9s Nusser and released like third single of the album on February 1, 2013."]], ["Bernie Bonvoisin", ["Bernard Bonvoisin, known as Bernie Bonvoisin( born 9 July 1956 in Nanterre, Hauts- de- Seine), is a French hard rock singer and film director.", "He is best known for having been the singer of Trust.", "He was one of the best friends of Bon Scott the singer of AC/ DC and together they recorded the song\" Ride On\" which was one of the last songs by Bon Scott."]]]
supporting_facts: [["Six Strings Down", 0], ["Jimmie Vaughan", 0]]
evidences: [["Six Strings Down", "performer", "Jimmie Vaughan"], ["Jimmie Vaughan", "country of citizenship", "United States"]]
answer: United States