Question: Iceberg Slim, given name Robert Beck,  was an American pimp who subsequently became an influential author, Beck's fiction have been acknowledged as an influence by several rap musicians, from which genre?

Context paragraphs:
Robert Beck (painter): Robert Beck (born 1950) is an American painter known for his plein air and studio images of the people, occupations, and events of our time.  Beck approaches a wide range of subjects in his work, often painting live under distracting and difficult circumstances.  He addresses some larger topics through multiple-painting "essays", in which each image describes a facet of the subject.  Beck is also a writer, teacher, curator and lecturer; he writes a monthly column for ICON magazine that parallels his painting, and is the past host of a weekly radio interview show on WDVR-FM.  In 2014, he was awarded the Philadelphia Sketch Club Medal for Excellence and Contribution to the Arts.

Erin Li: Erin Li is a Taiwanese American filmmaker, writer, director and producer.  She has directed and written the short films "To The Bone" (which screened at the 2013 Slamdance Film Festival and the 2012 Los Angeles Film Festival), "L.A. Coffin School" (which screened at the 2011 Los Angeles Asian Pacific Film Festival and the 2012 San Francisco International Asian American Film Festival) and others.  She has also served as an Associate Producer on the documentaries "Iceberg Slim: Portrait of a Pimp" (2012), "The Girls in the Band" (2011), "America The Beautiful 2: The Thin Commandments" (2011), and "Voices Unveiled: Turkish Women Who Dare" (2009).

Payback Press: The Payback Press was a specialist imprint of Canongate Books devoted to (initially) reprints of classic black crime novels, which later branched out into contemporary black fiction.  Notable authors included Chester Himes and Clarence Cooper Jr and Iceberg Slim.  As with Rebel Inc., after its successful foundation in the late 1990s, it was discontinued due to a financial crisis in its parent company.

Roberts (surname): Roberts is a surname of Norman origin, deriving from the Norman given name Robert, meaning "bright renown" – from the Germanic elements "hrod" meaning renown and "beraht" meaning bright.  Roberts may mean either "servant of Robert" or "son of Robert"; the latter is more common in Wales, while the former is more common in England.  Although the name Robert was known in the British isles before the Norman Conquest in 1066, it was mainly introduced into Britain by the Normans.  Today the surname Roberts is common in England, Wales, Ireland and the Isle of Man, with the biggest concentration by far occurring in North Wales.  In colloquial North-Walian Welsh "Roberts" is often pronounced as "Robaits".  The name is also common in Scotland.

Iceberg Slim: Robert Beck (born Robert Lee Maupin or Robert Moppins, Jr.; August 4, 1918 – April 28, 1992), better known as Iceberg Slim, was an American pimp who subsequently became an influential author among a primarily African-American readership.  Beck's novels were adapted into movies, and the imagery and tone of Beck's fiction have been acknowledged as an influence by several rap musicians, including Ice T and Ice Cube, whose names are homages to Beck.

Frank C. Matthews: Frank C. Matthews (born July 13, 1972) is an African-American writer of urban fiction.  His works are influenced by Iceberg Slim and Donald Goines.

Gangsta rap: Gangsta rap or gangster rap is a subgenre of hip hop music with themes and lyrics that generally emphasize the "gangsta" lifestyle.  The genre evolved from hardcore hip hop into a distinct form, pioneered in the mid-1980s by rappers such as Schoolly D and Ice-T, and was popularized in the later part of the 1980s by groups like N.W.A.  After the national attention that Ice-T and N.W.A attracted in the late 1980s and early 1990s, gangsta rap became the most commercially lucrative subgenre of hip hop.  Many (if not most) gangsta rap artists openly boast of their associations with various active street gangs as part of their artistic image, with the Bloods and Crips being the most commonly represented.  Gangsta rap is closely related to other indigenous gang and crime-oriented forms of music, such as the narcocorrido genre of northern Mexico.

Clarence Beck: Clarence Robert Beck (March 13, 1896 – August 20, 1962) was a professional football player from Harrisburg, Pennsylvania.  Beck attended high school at Harrisburg Tech where he scored a 105-yard touchdown for Tech against their rival Steelton.  After high school, Beck attended Pennsylvania State University where he became a star offensive tackle.  Beck made his professional debut in the National Football League in 1925 with the Pottsville Maroons.  He played in the NFL for one season.  Prior to that, he played for the independent Union Quakers of Philadelphia in 1921.

Donald Goines: Donald Goines (pseudonym: Al C. Clark) (December 15, 1936 – October 21, 1974) was an African-American writer of urban fiction.  His novels were deeply influenced by the work of Iceberg Slim.

Roland Taylor: Roland Morris "Fatty" Taylor (born March 13, 1946) is an American former professional basketball player.  A 6’0" guard born in Washington, D.C. and an alum of La Salle University, Taylor joined the American Basketball Association in 1969.  After one year playing for the Washington Capitals, he moved on to the Virginia Squires, with whom he spent the prime of his career, tallying 3,495 points, 1,737 assists, and 1,715 rebounds in five seasons.  Taylor became known as one of the few outstanding defensive players in a league known primarily for a "run-and-gun" style.  On the Squires Taylor played with former or later NBA stars including Adrian Smith, "Jumbo" Jim Eakins and Julius "Doctor J" Erving.  For one-and-a-half seasons Taylor was a teammate of George Gervin, and Taylor has been credited with coining Gervin's nickname "The Iceman" (he first called Gervin "Iceberg Slim", which gradually developed into the more familiar nickname).  Taylor spent one season in the NBA (1976–77) as a member of the Denver Nuggets, and he retired in 1977 with combined ABA/NBA totals of 5,098 points, 2,563 assists, and 2,524 rebounds.

Supporting paragraphs: Iceberg Slim Gangsta rap
Answer: Gangsta rap