Question: Heidi Newfield and Tim Rushlow, have which nationality?

full_context: Document 1: Heidi Newfield: Heidi Newfield (born October 4, 1970) is an American country music artist. She was lead singer, rhythm guitarist and harmonica player for the group Trick Pony, alongside Keith Burns and Ira Dean from 1996 until 2006, when she left in pursuit of a solo career. Newfield has begun her solo career on Curb Records, debuting in 2008 with the single, "Johnny & June." This song, which peaked at No. 11 on the Hot Country Songs charts, is the first release from her solo debut album, "What Am I Waiting For", which has produced a second Top 30 country hit, "Cry Cry ('Til the Sun Shines)."
Document 2: Randy Travis: Randy Bruce Traywick (born May 4, 1959), better known by his stage name, Randy Travis, is an American country music singer, songwriter, guitarist, and actor. Since 1985, he has recorded 20 studio albums and charted more than 50 singles on the "Billboard" Hot Country Songs charts, and 16 of these were number-one hits. Considered a pivotal figure in the history of country music, Travis broke through in the mid-1980s with the release of his album "Storms of Life", which sold more than four million copies. The album established him as a major force in the Neotraditional country movement. Travis followed up his successful debut with a string of platinum and multi-platinum albums. He is known for his distinctive baritone vocals, delivered in a traditional style that has made him a country music star since the 1980s.
Document 3: Cry Cry ('Til the Sun Shines): "Cry Cry ('Til the Sun Shines)" is a song originally recorded by Martina McBride on her 2007 album "Waking Up Laughing". It was later recorded by American country music artist Heidi Newfield and released in November 2008 as the second single from the album "What Am I Waiting For". The song reached #29 on the "Billboard" Hot Country Songs chart. The song was written by Marv Green, Aimee Mayo, Chris Lindsey and Hillary Lindsey.
Document 4: Carrie Underwood: Carrie Marie Underwood (born March 10, 1983) is an American singer, songwriter, and actress. She rose to fame as the winner of the fourth season of "American Idol" in 2005. Her debut album, "Some Hearts", was released in 2005. Bolstered by the huge crossover success of the singles "Jesus, Take the Wheel" and "Before He Cheats", it became the best-selling solo female debut album in country music history, the fastest-selling debut country album in Nielsen SoundScan history and the best-selling country album of the last 14 years. Underwood won three Grammy Awards for the album, including Best New Artist.
Document 5: Right Now (Rushlow album): Right Now is the only album released by the American country music band Rushlow, a band fronted by former Little Texas vocalist Tim Rushlow. "Right Now" produced two singles for the band on the Hot Country Songs charts: "I Can't Be Your Friend" at #16 and "Sweet Summer Rain" at #42. Additionally, the title track was later recorded by Dean Miller on his 2005 album "Platinum". "I Can't Be Your Friend" was covered by DHT on their 2005 album "Listen to Your Heart".
Document 6: Little Texas (band): Little Texas is an American country music band founded in Nashville, Tennessee, in 1988 by Tim Rushlow (lead vocals, rhythm guitar), Brady Seals (lead and background vocals, guitars, keyboards), Del Gray (drums), Porter Howell (lead guitar, background vocals), Dwayne O'Brien (rhythm guitar, lead and background vocals), and Duane Propes (bass guitar, background vocals). Signed to Warner Bros. Records in 1991, Little Texas released its debut album "First Time for Everything" that year. The album's lead off single, "Some Guys Have All the Love", reached a peak of No. 8 on the "Billboard" Hot Country Singles & Tracks charts. Little Texas continued to produce hit singles throughout the mid-1990s, including the Number One single "My Love" and six more top ten hits. Their debut album earned a gold certification from the Recording Industry Association of America (RIAA), while 1993's "Big Time" was certified double platinum and 1994's "Kick a Little" was certified platinum.
Document 7: Janie Fricke discography: The discography of Janie Fricke, an American country artist, consists of twenty three studio albums, one live album, one tribute album, nine compilation albums, forty two singles, two music videos, and seventeen other appearances. Fricke was signed to Nashville's Columbia Records as a solo artist in 1977. Later that year, her debut single, "What're You Doing Tonight", reached the top-forty on the country songs chart. The following year her debut studio album, "Singer of Songs", was issued. Between 1978 and 1980, Fricke issued three studio albums which resulted in two major hits: "Please Help Me, I'm Fallin" (1978) and "I'll Love Away Your Troubles for Awhile" (1979). With a change in musical direction, Fricke began recording ballads in 1980, strengthening the success of her singles. "Down to My Last Broken Heart" and "I'll Need Someone to Hold Me (When I Cry)" were her first pair of top-ten hits on the "Billboard" Hot Country Singles chart. An album of the same was also released that year, which reached the top-thirty on the Top Country Albums chart. With her sixth studio album, Fricke reached the top spot of the "Billboard" country chart with its second single "Don't Worry 'bout Me Baby" (1982). This would start a series of number-one country singles during this period. "It Ain't Easy" (1982), her seventh studio record, reached number fifteen on the Top Country Albums list and spawned three number-one hits: "It Ain't Easy Bein' Easy", "He's a Heartache (Looking for a Place to Happen)", and "Tell Me a Lie".
Document 8: The Lost Trailers: The Lost Trailers are an American country music band. Established in 2000, the band originally comprised Ryder Lee (lead vocals, keyboards), Manny Medina (guitar), Andrew Nielson (bass guitar), Stokes Nielson (vocals, lead guitar), and Jeff Potter (drums). Originally known as Stokes Nielson and The Lost Trailers, the band made its debut at a Fourth of July picnic held by country singer Willie Nelson. That year, The Lost Trailers self-released its debut album "Story of the New Age Cowboy", followed in 2002 by "Trailer Trash", followed by 2004's "Welcome to the Woods" on Universal/Republic. After switching to BNA Records in 2006, the band issued a self-titled effort, which produced the singles "Call Me Crazy" and "Why Me", both of which entered the "Billboard" Hot Country Songs charts. A fifth album, "Holler Back", was released in August 2008, producing a Top Ten country hit in its title track and a Top 20 in "How 'Bout You Don't".
Document 9: She Misses Him: "She Misses Him" is a song written by Tim Johnson, and recorded by American country music artist Tim Rushlow. It was released in October 2000 as the second single from his self-titled album. The song peaked at number 8 on the U.S. country charts. It also reached number 59 on the "Billboard" Hot 100. It was his highest peaking single and his only top 40 single on the country charts. It was also Rushlow's only peaking single on the Hot 100.
Document 10: Tim Rushlow: Timothy Ray "Tim" Rushlow (born October 6, 1966) is an American country music artist. Between 1991 and 1997, Rushlow was lead vocalist of country music group Little Texas, which recorded four albums and a Greatest Hits package, in addition to charting more than fifteen singles on the "Billboard" country singles charts during Rushlow's tenure as lead vocalist.
Document 11: Jake Owen: Joshua Ryan "Jake" Owen (born August 28, 1981) is an American country music singer and songwriter. Signed to RCA Nashville in 2006, he released his debut studio album "Startin' with Me" that year. This album produced three singles, all of which reached top 20 on the "Billboard" Hot Country Songs chart: his debut single "Yee Haw", "Startin' with Me", and "Something About a Woman". A second studio album, 2009's "Easy Does It", has accounted for three more singles: "Don't Think I Can't Love You", "Eight Second Ride", and "Tell Me". In September 2011, Owen achieved his first number one hit on the country charts with the title track to his third studio album "Barefoot Blue Jean Night", as did with "Alone with You", "The One That Got Away", and "Anywhere with You". His fourth studio album, "Days of Gold" produced two singles with its title track, which broke the top 20 in 2014, and the number one single "Beachin'".
Document 12: Johnny &amp; June (song): "Johnny & June" is the solo debut song co-written and recorded by American country music singer Heidi Newfield, the former lead singer of the group Trick Pony. It was released in March 2008 as the first single from her debut album "What Am I Waiting For", which was released in August 2008 on Curb Records. The song reached a peak of #11 on the Hot Country Songs charts in late September 2008.
Document 13: Tracy Byrd: Tracy Lynn Byrd (born December 17, 1966) is an American country music artist. Signed to MCA Nashville Records in 1993, Byrd broke through on the country music scene that year with his single "Holdin' Heaven", which reached Number One on "Billboard" Hot Country Singles & Tracks. Although he did not land a second Number One until 2002's "Ten Rounds with Jose Cuervo", Byrd has charted more than thirty hit singles in his career, including eleven additional Top Ten hits. He has also released ten studio albums and two greatest-hits albums, with four gold certifications and one double-platinum certification from the RIAA.
Document 14: Rushlow: Rushlow was an American country music band founded in 2003 by Tim Rushlow, who was originally the lead vocalist of the country music band Little Texas until 1997, when he left for a solo career. In addition to Tim Rushlow, who assumed the role of lead vocalist, the group was composed of his first cousin Doni Harris (banjo, acoustic guitar, vocals), as well as Kurt Allison (acoustic guitar, electric guitar, vocals), Tully Kennedy (bass guitar, vocals), Rich Redmond (drums), and Billy Welch (keyboards).
Document 15: Tim Rushlow (album): Tim Rushlow is the solo debut album of American country music artist Tim Rushlow, formerly co-lead vocalist of the country music band Little Texas. Released in February 2001 on Atlantic Records, it is also his only solo album, although he did release another album and two singles in the band Rushlow, as well as two more singles in the duo Rushlow Harris. "Tim Rushlow" accounted for four singles on the "Billboard" country singles charts, including "She Misses Him", his only Top 40 country hit. After Atlantic Records shut down, the album was re-released in 2002 on The Scream Recordings Label and retitled "Crazy Life" after the song of same. An extra track, "As Real as Forever" was included.
ground_truth: American