Question: Who is an American musician, Peter Chelsom or Billy Bob Thornton?

full_context: Document 1: Peter Cattaneo: Peter Joseph Cattaneo (born 1 July 1964) is a two-time Academy Award-nominated and two-time Bafta winning English filmmaker most famous for directing the hit British film "The Full Monty" (1997).
Document 2: Billy Bob Thornton: William Robert "Billy Bob" Thornton (born August 4, 1955) is an American actor, filmmaker, singer, songwriter, and musician.
Document 3: Bobbie Gentry: Roberta Lee Streeter (born July 27, 1944), professionally known as Bobbie Gentry, is an American singer-songwriter notable as one of the first female country artists to compose and produce her own material. Her songs typically drew on her Mississippi roots to compose vignettes of the Southern United States.
Document 4: Richard Curtis: Richard Whalley Anthony Curtis, CBE (born 8 November 1956) is a British screenwriter, producer and film director, who was born in New Zealand to Australian parents. One of Britain's most successful comedy screenwriters, he is known primarily for romantic comedy films such as "Four Weddings and a Funeral", "Bridget Jones's Diary", "Notting Hill", and "Love Actually", as well as the hit sitcoms "Blackadder", "Mr. Bean" and "The Vicar of Dibley". He is also the co-founder of the British charity Comic Relief along with Sir Lenny Henry.
Document 5: Live at Billy Bob's Texas (Stoney LaRue album): Live at Billy Bob's Texas is Stoney LaRue's first live album. They are one of many bands to record a "Live at Billy Bob's Texas" album at the Fort Worth honky-tonk. It was originally released in September 2005 as a limited edition CD/DVD combo. It was re-released in 2006 with the full track listing. The album included one new song, "Love You For Loving Me," as well as six cover songs. The song, "Feet Don't Touch The Ground," was originally recorded by Brandon Jenkins on his 2003 album, "Unmended". The song "Oklahoma Breakdown" was originally recorded by the Norman-based group, Hosty Duo. "Goin' Down the Road (Feelin' Bad) is a folk song originally sung by Woody Guthrie. The song The Weight was written by Robbie Robertson and recorded by The Band on their 1968 album, "Music from Big Pink". "Long Black Veil" is a 1959 song, written by Danny Dill and Marijohn Wilkin and originally recorded by Lefty Frizzell as well as many other artists. The album's cover photograph was by Texas photographer Todd Purifoy.
Document 6: Peter Chelsom: Peter Chelsom (born 20 April 1956) is a British film director, writer, and actor. He has directed such films as "Hector and the Search for Happiness", "Serendipity", and "Shall We Dance?" Peter Chelsom is a member of the British Academy, the American Academy, The Directors Guild Of America, and The Writers Guild Of America.
Document 7: Billy Gibbons: William Frederick Gibbons (born December 16, 1949) is an American musician, singer, songwriter, producer, and actor, best known as the guitarist and lead vocalist of the American rock band ZZ Top. He began his career in the Moving Sidewalks, who recorded "Flash" (1968) and opened four dates for the Jimi Hendrix Experience. Gibbons formed ZZ Top in late 1969 and released "ZZ Top's First Album" in 1971. The albums that followed, "Rio Grande Mud" (1972) and "Tres Hombres" (1973), along with extensive touring, solidified the group's reputation as a hard-rocking power trio.
Document 8: Peter Sollett: Peter Sollett (born January 1, 1976) is an American film director and screenwriter known for his feature films "Raising Victor Vargas" (2002) and "Nick & Norah's Infinite Playlist" (2008).
Document 9: Peter Segal: Peter Segal (born 1962) is an American film director, producer, screenwriter and actor. Segal has directed the comedy films "Tommy Boy" (1995), "My Fellow Americans" (1996), "" (2000), "Anger Management" (2003), "50 First Dates" (2004), "The Longest Yard" (2005), "Get Smart" (2008), " Grudge Match" (2013).
Document 10: Willie Nelson: Willie Hugh Nelson (born April 29, 1933) is an American musician, singer, songwriter, author, poet, actor, and activist. The critical success of the album "Shotgun Willie" (1973), combined with the critical and commercial success of "Red Headed Stranger" (1975) and "Stardust" (1978), made Nelson one of the most recognized artists in country music. He was one of the main figures of outlaw country, a subgenre of country music that developed in the late 1960s as a reaction to the conservative restrictions of the Nashville sound. Nelson has acted in over 30 films, co-authored several books, and has been involved in activism for the use of biofuels and the legalization of marijuana.
Document 11: Daddy and Them: Daddy and Them is a 2001 American film written, directed by, and starring Billy Bob Thornton. In addition to Thornton, it stars Laura Dern, Andy Griffith, Ben Affleck, Kelly Preston, Diane Ladd, Brenda Blethyn, Tuesday Knight, Jamie Lee Curtis and Jim Varney. This was Jim Varney's last live-action film; he died a year before the movie's release. It was also his penultimate movie.
Document 12: Bandits (2001 film): Bandits is a 2001 American criminal comedy-drama film directed by Barry Levinson. It stars Bruce Willis, Billy Bob Thornton, and Cate Blanchett. Filming began in October 2000 and ended in February 2001. It helped Thornton earn a National Board of Review Best Actor Award for 2001. Thornton and Blanchett's performances earned praise, as each was nominated for Best Actor and Best Actress Golden Globe Awards for their performances in this film, while Blanchett was nominated for Best Supporting Actress at the Screen Actors Guild Awards. It first opened in theaters on October 12, 2001.
Document 13: Sling Blade (film): Sling Blade is a 1996 American drama film set in rural Arkansas, written and directed by Billy Bob Thornton, who also stars in the lead role. It tells the story of a man named Karl Childers who has a developmental disability and is released from a psychiatric hospital, where he has lived since killing his mother and her lover when he was 12 years old, and the friendship he develops with a young boy and his mother. In addition to Thornton, it stars Dwight Yoakam, J. T. Walsh, John Ritter, Lucas Black, Natalie Canerday, James Hampton, and Robert Duvall.
Document 14: Serendipity (film): Serendipity is a 2001 American romantic comedy film directed by Peter Chelsom, written by Marc Klein, and starring John Cusack and Kate Beckinsale. The music score was composed by Alan Silvestri.
Document 15: Peter Farrelly: Peter John Farrelly (born December 17, 1956) is an American film director, screenwriter, producer and novelist. The Farrelly brothers are mostly famous for directing and producing gross-out humor romantic comedy films such as "Dumb and Dumber", "Shallow Hal", "Me, Myself and Irene", "There's Something About Mary" and the 2007 remake of "The Heartbreak Kid". In addition to his extensive film career, Peter is also an acting board member of the online media company DeskSite.
ground_truth: "Billy Bob" Thornton