Question: Are Rocky Shades and Coko both from the United States?

full_context: Document 1: Cheryl Wilson: Cheryl Wilson is a session singer who has had multiple No. 1 dance songs on the UK "Billboard" chart and has performed with many notable artists including Celine Dion, R. Kelly, Alice Peacock, Mavis Staples, The Smashing Pumpkins, Bertie Higgins, Michael Bolton, Bill Withers, Peabo Bryson, David Foster, Josh Grobin, Enrique Iglesias, Nick Carter, KMFDM, Cameo, Rod Stewart, Ray Charles, Natalie Cole, Mel Torme, Spike Lee, Tony Bennett, Peter Cetera, and Martha Wash. She has also sung in commercials for companies such as McDonald's and is a member of the Jazz & Contemporary Studies Faculty at Roosevelt University in Chicago. She contributes vocals to Jim Warner's Chicago musical project, Akalibrio. Her performance on the KMFDM song "Power" was described as "soul-mama vamping".
Document 2: Rocky Shades: Robert K. Barklay (born January 22, 1960), professionally known as Rocky Shades, is an English singer.
Document 3: Robert Palmer (singer): Robert Allen Palmer (19 January 1949 – 26 September 2003) was an English singer-songwriter, musician, and record producer. He was known for his distinctive, soulful voice, eclectic mix of musical styles on his albums, combining soul, jazz, rock, pop, reggae, blues, and sartorial acumen. He found success both in his solo career and with the Power Station, and had Top 10 songs in both the UK and the US.
Document 4: Robert John: Robert John (born Robert John Pedrick, Jr. January 3, 1946) is an American singer-songwriter perhaps best known for his 1979 hit single, "Sad Eyes", which reached No. 1 on the US "Billboard" Hot 100.
Document 5: The Shadows discography: This article presents the discography (including sheet music) of British rock group The Shadows. For releases with Cliff Richard see the Cliff Richard discography.
Document 6: Robert Carr (baritone): Robert Carr (12 April 1881 – 20 November 1948) was an English baritone singer and prolific recording artist. Born in London, he studied at the Guildhall School of Music and Drama under Bantock Pierrepoint. He recorded under his own name and as variously Richard Condor, William Duncan, Harry Durrant, Robert Durrant, Ernest Gray, Bobby Gray, Robert Oswald, and perhaps some others.
Document 7: Cher: Cher ( ; born Cherilyn Sarkisian; May 20, 1946) is an American singer and actress. Sometimes referred to as the Goddess of Pop, she has been described as embodying female autonomy in a male-dominated industry. She is known for her distinctive contralto singing voice and for having worked in numerous areas of entertainment, as well as adopting a variety of styles and appearances during her five-decade-long career.
Document 8: Rod Stewart: Sir Roderick David "Rod" Stewart, {'1': ", '2': ", '3': ", '4': "} (born 10 January 1945) is a British rock singer and songwriter. Born and raised in London, he is of Scottish and English ancestry. Stewart is one of the best-selling music artists of all time, having sold over 100 million records worldwide. He has had six consecutive number one albums in the UK and his tally of 62 UK hit singles includes 31 that reached the top ten, six of which gained the #1 position. Stewart has had 16 top ten singles in the US, with four reaching #1 on the "Billboard" Hot 100. He was knighted in the 2016 Birthday Honours for services to music and charity.
Document 9: The Shadows: The Shadows are a British instrumental rock group, and were Cliff Richard's backing band from 1958 to 1968, (though they have collaborated again on numerous reunion tours). The Shadows have placed 69 UK charted singles from the 1950s to the 2000s, 35 credited to the Shadows and 34 to Cliff Richard and the Shadows. The group, who were in the forefront of the UK beat-group boom, were the first backing band to emerge as stars. As pioneers of the four-member instrumental format, the band consisted of lead guitar, rhythm guitar, bass guitar and drums. Their range covers pop, rock, surf rock and ballads with a jazz influence.
Document 10: CeCe Winans: Priscilla Marie Winans Love known professionally as CeCe Winans (born October 8, 1964) is an American gospel singer, who has sold over 12 million records worldwide and won ten Grammy Awards. She is the best-selling female gospel artist of all time, as of 2015.
Document 11: Coky Giedroyc: Mary Rose Helen "Coky" Giedroyc, Lady Bowyer-Smyth ( ; born 1962) is a BAFTA-nominated English director known for her work on "Women Talking Dirty", "The Virgin Queen", "The Nativity" and "Penny Dreadful". She is the elder sister of actress and presenter Mel Giedroyc.
Document 12: A Special Christmas: A Special Christmas is an album by R&B group SWV that was released in the United States on November 18, 1997, by RCA Records. It is a holiday album featuring both cover versions and original material. "A Special Christmas" would be the penultimate album the trio recorded together before they disbanded in 1998. Coko, the group's lead singer, released her first solo album in 1999.
Document 13: The Clark Sisters: The Clark Sisters are an American gospel vocal group consisting of five sisters: Jacky Clark Chisholm (b. 1948), Denise Clark Bradford (b. 1953), Elbernita "Twinkie" Clark-Terrell (b. 1954), Dorinda Clark-Cole (b. 1957), and Karen Clark Sheard (b. 1960). The Clark Sisters are the daughters of gospel musician and choral director Mattie Moss Clark. They are credited for helping to bring gospel music to the mainstream and are considered as pioneers of contemporary gospel. Their biggest crossover hits include: "Is My Living in Vain?", "Hallelujah", "He Gave Me Nothing to Lose", "Endow Me", their hit song "Jesus Is A Love Song", "Pure Gold", "Expect a Miracle", and their largest mainstream crossover gold certified, "You Brought the Sunshine". The Clark Sisters have won three Grammy Awards. With 16 albums to their credit and millions in sales, the Clark Sisters are the highest-selling female gospel group in history.
Document 14: Robert Smith (musician): Robert James Smith (born 21 April 1959) is an English singer, songwriter and musician. He is the lead singer, guitarist, lyricist and principal songwriter of the rock band the Cure. He is the band's only constant member since its formation in 1976. He has also played guitar in the band Siouxsie and the Banshees. Smith is a multi-instrumentalist, known for his unique stage look and distinctive voice.
Document 15: Coko: Cheryl Elizabeth Gamble (born June 13, 1970), better known by her stage name Coko, also known as Cheryl Clemons, is an American R&B recording artist and television personality. Gamble is best known as the lead singer of the American R&B vocal trio Sisters With Voices (SWV). Aside from her R&B career, Gamble also has a solo gospel career.
ground_truth: no