Question: Philadelphia group The Majors performed in which genre of group-harmony R&B style?
Context: Eldridge Holmes (1942 – November 13, 1998) was a New Orleans singer, who recorded throughout the 1960s and into the 1970s, primarily with producer Allen Toussaint.  First recorded by Toussaint in a traditional New Orleans R&B style on "Poor Me", Holmes progressed to soul and funk, occasionally achieving release on national labels, but never cracking the R&B charts.  He seems to have stopped recording by the mid-70s. This list contains singers and groups who performed in the new jack swing (or swingbeat) style, a hybrid style popular from the mid-1980s into the early 1990s.  It fuses the rhythms, samples and production techniques of hip hop and dance-pop music with the urban contemporary sound of R&B.  The new jack swing style developed as many previous R&B styles did, by combining elements of older styles with newer trends.  It uses mellifluously soulful solo or harmonizing vocals sung over rhythms and "street" beats derived from urban musical influences.  The sound of new jack swing comes from the hip hop "swing" beats created by drum machine, and hardware samplers, which was popular during the golden age of hip hop, with contemporary R&B style singing. New jack swing or swingbeat is a fusion genre spearheaded by Teddy Riley and Bernard Belle that became popular from the late 1980s into the early 1990s.  Its influence, along with hip hop, seeped into pop culture and was the definitive sound of the inventive black New York club scene.  It fuses the rhythms, samples, and production techniques of hip hop and dance-pop with the urban contemporary sound of R&B.  The new jack swing style developed as many previous music styles did, by combining elements of older styles with newer sensibilities.  It used R&B style vocals sung over hip hop and dance-pop style influenced instrumentation.  The sound of new jack swing comes from the hip hop "swing" beats created by drum machine, and hardware samplers, which were popular during the Golden Age of Hip Hop, with contemporary R&B style singing. The Cadets were an American doo-wop group, formed in Los Angeles.  The group began as a gospel group, the Santa Monica Soul Seekers, in the late 1940s.  The members were Lloyd McCraw, Willie Davis, Austin "Ted" Taylor, Aaron Collins, Glendon Kingsby, and Will "Dub" Jones.  In 1955, the group auditioned for Modern Records, and were accepted.  The group decided to switch to the popular R&B style, with the exception of Kingsby, who left to continue in gospel music. Soul Avengerz is a British dance and techno group.  They have worked with Javine Hilton to produce a single called "Don't Let The Morning Come", and this single shows Javine's new music style, before she left the R&B style to perform dance music. The USS "Galveston" (CL-93/CLG-3) was a "Cleveland"-class light cruiser of the United States Navy that was later converted to a "Galveston"-class guided missile cruiser.  She was launched by William Cramp & Sons Shipbuilding Company, Philadelphia 22 April 1945, sponsored by Mrs. Clark Wallace Thompson.  The cruiser's construction was suspended when nearly complete on 24 June 1946; and the hull assigned to the Philadelphia Group of the Atlantic Reserve Fleet.  She was reclassified CLG-93 on 4 February 1956; then reclassified to CLG-3 on 23 May 1957; and commissioned at Philadelphia 28 May 1958, Captain J. B. Colwell in command. The Soul Survivors were an American garage rock band from Denver, Colorado, who were active in the mid-1960s.  Included in their roster were Allen Kemp and Pat Shanahan, who later become members of the Poor before joining Ricky Nelson as members of his "Stone Canyon Bad" and later the New Riders of the Purple Sage in the late 1970s.  They are not to be confused with the Philadelphia group of the same name. The Majors were an American R&B and Doo-wop group from Philadelphia, Pennsylvania. 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. Sel is a quartet of Lithuanian performers.  They are well known for their numerous chart-topping singles and albums in the Baltic countries.  The group's head is Egidijus Dragunas.  The group also contains a DJ, a back-vocalist and songwriter and a non-electronic instrument player.  The group's style has changed throughout the years - the first albums created by Sel are usually categorized as Hip-Hop and rock works.  With their later albums, Sel turned to a more Acid-House/R&B style, but still remained loyal to their original fast-paced rap vocals and light crunk.  The group has worked with many European artists and created over thirty songs that have ranked high on the top 40 Hottest Lithuanian Songs List.
Answer: Doo-wop