Question: Philadelphia group The Majors performed in which genre of group-harmony R&B style?

full_context: Document 1: Rapping: Rapping (or rhyming, spitting, emceeing, MCing ) is a musical form of vocal delivery that incorporates "rhyme, rhythmic speech, and street vernacular", which is performed or chanted in a variety of ways, usually over a backbeat or musical accompaniment. The components of rap include "content" (what is being said), "flow" (rhythm, rhyme), and "delivery" (cadence, tone). Rap differs from spoken-word poetry in that rap is usually performed in time to an instrumental track. Rap is often associated with, and is a primary ingredient of hip-hop music, but the origins of the phenomenon predate hip-hop culture. The earliest precursor to the modern rap is the West African griot tradition, in which "oral historians", or "praise-singers", would disseminate oral traditions and genealogies, or use their formidable rhetorical techniques for gossip or to "praise or critique individuals." Griot traditions connect to rap along a lineage of Black verbal reverence that goes back to ancient Egyptian practices, through James Brown interacting with the crowd and the band between songs, to Muhammad Ali's quick-witted verbal taunts and the palpitating poems of the Last Poets. Therefore, rap lyrics and music are part of the "Black rhetorical continuum", and aim to reuse elements of past traditions while expanding upon them through "creative use of language and rhetorical styles and strategies. The person credited with originating the style of "delivering rhymes over extensive music", that would become known as rap, was Harlem, New York native, Anthony "DJ Hollywood" Holloway.
Document 2: Harold Melvin &amp; the Blue Notes: Harold Melvin & the Blue Notes were an American R&B/Soul vocal group, one of the most popular Philadelphia soul groups of the 1970s. The group's repertoire included soul, R&B, doo-wop, and disco. Founded in Philadelphia, Pennsylvania in the middle of the 1950s as The Charlemagnes, the group is most noted for several hits on Gamble and Huff's Philadelphia International label between 1972 and 1976, although they performed and recorded until Melvin's death in 1997. However, the remaining members of the Blue Notes have reunited twice for two Soul Train Cruises, one in 2013 and another one in 2015, during the fourth sailing. Despite group founder and original lead singer Harold Melvin's top billing, the Blue Notes' most famous member was Teddy Pendergrass, their lead singer during the successful years at Philadelphia International. In 2013 and 2015, The group reunited when The Centric Network presented the Soul Train Cruise, and The Blue Notes reunited for both events, although they only performed during the fourth sailing in the 2015 event.
Document 3: Hall &amp; Oates: Daryl Hall and John Oates, often referred to as Hall & Oates, are an American musical duo from Philadelphia. Daryl Hall is generally the lead vocalist of the pairing. John Oates primarily plays electric guitar and provides backing vocals. The two write most of the songs they perform, either separately or in collaboration. They achieved their greatest fame from the late 1970s to the mid-1980s with a fusion of rock and roll and rhythm and blues.
Document 4: Soul blues: Soul blues is a style of blues music developed in the late 1960s and early 1970s that combines elements of soul music and urban contemporary music. Singers and musicians who grew up listening to the traditional electric blues of artists such as Muddy Waters, Bo Diddley, Jimmy Reed and Elmore James; soul singers such as Sam Cooke, Ray Charles and Otis Redding; and gospel music wanted to bridge their favorite music together. Bobby Bland was one of the pioneers of this style. This is a subgenre of blues that is very popular with African American audiences but less known by white audiences. The style continues to be popular in the new millennium.
Document 5: The Majors (band): The Majors were an American R&B and Doo-wop group from Philadelphia, Pennsylvania.
Document 6: Hip hop in Washington, D.C.: Hip hop music in Washington, D.C. has been an important part of the culture of the area. The traditional style of hip hop in the city has been described as not quite the same as New York City hip hop and not quite the same as Southern hip hop. Rather, it has been influenced by both regions to form its own unique style of music. The population of D.C. is not large enough to support as many distinct subgenres of rap as other metropolitan areas, and as a result, the sound and style of D.C. hip hop is very mixed and blended. Prominent D.C. based hip hop artists include Wale, Oddisee, Fat Trel, Shy Glizzy, Lightshow, Ant Glizzy, Percy Jonez & Santino Ranks of YNWV and a few newcomers , GoldLink, Chaz French & Jay IDK. Many of these newcomers are typically featured on local radio stations such as 93.9 WKYS. 20bello a rapper, director and promoter was the original founder of the DMV (DC area moniker) Music movement. He remains to this day very instrumental in creating a music scene where young upcoming artist could thrive hence the recent article in the Washington Examiner
Document 7: Boyz II Men: Boyz II Men is an American R&B vocal group from Philadelphia, Pennsylvania, best known for emotional ballads and "a cappella" harmonies. They are currently a trio composed of baritone Nathan Morris alongside tenors Wanya Morris and Shawn Stockman. During the 1990s, Boyz II Men found fame on Motown Records as a quartet including bass Michael McCary, who left the group in 2003 due to health issues.
Document 8: Major Key (album): Major Key (stylized as Major 🔑) is the ninth studio album by American musician <a href="DJ%20Khaled">DJ Khaled</a>. It was released on July 29, 2016, by We the Best Music Group and Epic Records. The album features guest appearances from Future, Big Sean, Rick Ross, Jay-Z, Drake, Nas, Kendrick Lamar, Betty Wright, J. Cole, Bryson Tiller, Nicki Minaj, Chris Brown, August Alsina, Jeremih, Kodak Black, Jeezy, French Montana, YG, Yo Gotti, Gucci Mane, 2 Chainz, Jadakiss, Fabolous, Fat Joe, Busta Rhymes, Kent Jones, Travis Scott, Lil Wayne, Meghan Trainor, Wiz Khalifa, Wale and Mavado.
Document 9: Sports in Philadelphia: Philadelphia, Pennsylvania, has been home to many teams and events in professional, semi-professional, amateur, college, and high-school sports. Philadelphia is one of twelve cities that hosts teams in all four major sports leagues in North America, and Philadelphia is one of just three cities in which one team from every league plays within city limits. These major sports teams are the Philadelphia Phillies of Major League Baseball, the Philadelphia Eagles of the National Football League, the Philadelphia 76ers of the National Basketball Association and the Philadelphia Flyers of the National Hockey League. Each team has played in Philadelphia since at least the 1960s, and each team has won at least one championship. Since 2010, Philadelphia has been the home of the Philadelphia Union of Major League Soccer which plays in suburban Chester, Pennsylvania, making the Philadelphia market one of nine cities that hosts a team in the four major sports leagues and the MLS. Philadelphia hosts several college sports teams, including the Philadelphia Big 5 schools and Temple's Division I FBS football team. Many of these teams have fan bases in both Philadelphia and the surrounding Delaware Valley. In addition to the major professional and college sports, numerous semi-pro, amateur, community, and high school teams play in Philadelphia. The city hosts numerous sporting events, such as the Penn Relays and the Collegiate Rugby Championship, and Philadelphia has been the most frequent host of the annual Army-Navy football game. Philadelphia has also been the home of several renowned athletes and sports figures. Philly furthermore has played a historically significant role in the development of cricket and extreme wrestling in the United States.
Document 10: Music of the African diaspora: Music of the African diaspora was mostly refined and developed during the period of slavery. Slaves did not have easy access to instruments, so vocal work took on new significance. Through chants and work songs people of African descent preserved elements of their African heritage while inventing new genres of music. The culmination of this great sublimation of musical energy into vocal work can be seen in genres as disparate as Gospel Music and Hip-Hop. The music of the African diaspora makes frequent use of ostinato, a motif or phrase which is persistently repeated at the same pitch. The repeating idea may be a rhythmic pattern, part of a tune, or a complete melody. The banjo is a direct decedent of the Akonting created by the Jola people, found in Senegal, Gambia and Guinea-Bissau in West Africa. Hence, the melodic traditions of the African diaspora are probably most alive in Blues and Jazz.
Document 11: Hip hop: Hip hop or hip-hop is a subculture and art movement developed in South Bronx in New York City during the late 1970s. While people unfamiliar with hip hop culture often use the expression "hip hop" to refer exclusively to hip hop music (also called "rap"), Hip hop is characterized by nine distinct elements or expressive realms, of which hip hop music is only four elements (rapping, djaying, beatboxing and breaking). Afrika Bambaataa of the hip hop collective Zulu Nation outlined the pillars of hip hop culture, coining the terms: "rapping" (also called MCing or emceeing), a rhythmic vocal rhyming style (orality); DJing (and turntablism), which is making music with record players and DJ mixers (aural/sound and music creation); b-boying/b-girling/breakdancing (movement/dance); and graffiti art, which he called "aerosol writin'", although many say that the graffiti that hip hop adopted had been around years earlier, and had nothing to do with hip hop culture. (visual art). Other elements of hip hop subculture and arts movements beyond the main four are: hip hop culture and historical knowledge of the movement (intellectual/philosophical); beatboxing, a percussive vocal style; street entrepreneurship; hip hop language; and hip hop fashion and style, among others.
Document 12: Music of Philadelphia: The city of Philadelphia, Pennsylvania, is home to a vibrant and well-documented musical heritage, stretching back to colonial times. Innovations in classical music, opera, R&B, jazz and soul have earned the music of Philadelphia national and international renown. Philadelphia's musical institutions have long played an important role in the music of Pennsylvania, as well as a nationwide impact, especially in the early development of hip hop music. Philadelphia's diverse population has also given it a reputation for styles ranging from dancehall to Irish traditional music, as well as a thriving classical and folk music scene.
Document 13: Little Anthony and the Imperials: Little Anthony and the Imperials is an American rhythm and blues/soul vocal group from New York City, first active in the 1950s. Lead singer Jerome Anthony "Little Anthony" Gourdine was noted for his high-pitched voice, influenced by Jimmy Scott. The other original members were: Clarence Collins (group founder), Ernest Wright, Glouster "Nate" Rogers and Tracey Lord, the last two of whom were replaced by Samuel "Sammy" Strain. The group was one of the very few doo-wop groups to maintain success on the R&B and pop charts throughout the 1960s. They were inducted into the Rock and Roll Hall of Fame on April 4, 2009, 23 years after the group's first year of eligibility for induction.
Document 14: Doo-wop: Doo-wop is a genre of music that was developed in African-American communities of New York City, Philadelphia, Chicago, Baltimore, Newark, Pittsburgh, Cincinnati, Detroit, Washington, D.C. and Los Angeles in the 1940s, achieving mainstream popularity in the 1950s and early 1960s. Built upon vocal harmony, doo-wop was one of the most mainstream, pop-oriented R&B styles of the time. Singer Bill Kenny (1914–1978) is often called the "Godfather of Doo-wop" for his introducing the "top and bottom" format which featured a high tenor singing the lead and a bass singer reciting the lyrics in the middle of the song. Doo-wop features vocal group harmony, nonsense syllables, a simple beat, sometimes little or no instrumentation, and simple music and lyrics.
Document 15: Gospel music: Gospel music is a genre of Christian music. The creation, performance, significance, and even the definition of gospel music varies according to culture and social context. Gospel music is composed and performed for many purposes, including aesthetic pleasure, religious or ceremonial purposes, and as an entertainment product for the marketplace. Gospel music usually has dominant vocals (often with strong use of harmony) with Christian lyrics. Gospel music can be traced to the early 17th century, with roots in the black oral tradition. Hymns and sacred songs were often repeated in a call and response fashion. Most of the churches relied on hand clapping and foot stomping as rhythmic accompaniment. Most of the singing was done a cappella. The first published use of the term "gospel song" probably appeared in 1874. The original gospel songs were written and composed by authors such as George F. Root, Philip Bliss, Charles H. Gabriel, William Howard Doane, and Fanny Crosby. Gospel music publishing houses emerged. The advent of radio in the 1920s greatly increased the audience for gospel music. Following World War II, gospel music moved into major auditoriums, and gospel music concerts became quite elaborate.
ground_truth: Doo-wop