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Many musical styles flourished and combined in the 1940s and 1950s, most likely because of the influence of radio had in creating a mass market for music. World War II caused great social upheaval, and the music of this period shows the effects of that upheaval.

In the 1940s, the major strands of American music combined to form what would eventually be coined as rock and roll. Based most strongly off an electric guitar-based version of the Chicago blues, rock also incorporated jazz, country, folk, swing, and other types of music; in particular, bebop jazz and boogie woogie blues were in vogue and greatly influenced the music style. The style had developed by 1949, and quickly became popular among blacks nationwide (see 1949 in music). Mainstream success was slow to develop, though (in spite of early success with Bill Haley & His Comets' "Rock Around the Clock"), and didn't begin in earnest until Elvis Presley ("Hound Dog") began singing rock, R&B and rockabilly songs in a devoted black style. He quickly became the most famous and best-selling artist in American history, and a watershed point in the development of music.

In 1938, Bill Monroe formed the Blue Grass Boys (named after his native state of Kentucky, the blue grass state) and combined diverse influences into Appalachian folk music. These include Scottish, Irish and Eastern European folk, as well as blues, jazz and gospel. Monroe became the father of bluegrass music, and his band was a training ground for most of bluegrass' future stars, especially Lester Flatt and Earl Scruggs. Scruggs and Flatt popularized bluegrass as part of the Foggy Mountain Boys, which they formed in 1948. Though bluegrass never quite achieved mainstream status, it did become well-known through its use in several soundtracks, including the T.V. theme song for The Beverly Hillbillies and the movies Bonnie and Clyde and Deliverance. In the 1950s, bluegrass artists included Stanley Brothers, Osborne Brothers and Jimmy Martin's Sunny Mountain Boys.

The 1950s also saw the popular dominance of the Nashville sound in country music, and the beginning of popular folk music with groups like The Weavers. Country's Nashville sound was slick and soulful, and a movement of rough honky tonk developed in a reaction against the mainstream orientation of Nashville. This movement was centered in Bakersfield, California with musicians like Buck Owens ("Act Naturally"), Merle Haggard ("Sing a Sad Song") and Wynn Stewart ("It's Such a Pretty World Today") helping to define the sound among the community, made up primarily of Oklahoman immigrants to California, who had fled unemployment and drought. A similarly hard-edged sound also arose in Lubbock, Texas (Lubbock sound).

By the late 1950s, a revival of Appalachian folk music was taking place across the country, and bands like The Weavers were paving the way for future mainstream stars like Bob Dylan and Joan Baez. Bluegrass was similarly revitalized and updated by artists including Tony Rice, Clarence White, Richard Green, Bill Keith and David Grisman. The Dillards, however, were the ones to break bluegrass into mainstream markets in the early 1960s.

Following World War 2, gospel began its golden age. Artists like the Five Blind Boys of Mississippi, The Swan Silvertones, Clara Ward Singers and Sensational Nightingales became stars across the country; other early artists like Sam Cooke, Dionne Warwick, Dinah Washington, Johnnie Taylor, Aretha Franklin, Wilson Pickett began their career in gospel quartets during this period, only to achieve even greater fame in the 60s as the pioneers of soul music, itself a secularized, R&B-influenced form of gospel. Mahalia Jackson and The Staple Singers were undoubtedly the most successful of the golden age gospel artists.

In addition, doo wop achieved widespread popularity in the 1950s. Doo wop was a harmonically complex style of choral singing that developed in the streets of major cities like Chicago, New York, and, most importantly, Baltimore. Doo Wop singers would work a cappella without backing instruments, and practice in hallways of their schools, apartment buildings, or alleys to achieve echo effects on their voices, and lyrics were generally innocent youthful observations on the upsides of teen love and romance. Groups like The Crows ("Gee"), The Orioles ("It's Too Soon to Know") and Brooklyn's Frankie Lymon & the Teenagers ("Why Do Fools Fall in Love") had a string of hit songs that brought the genre to chart domination by 1958 (see 1958 in music).

Cuban mambo, chachachá and charanga bands enjoyed brief periods of popularity, and helped establish a viable Latin-American music industry, which led the way to the invention of salsa music among Cubans and Puerto Ricans in New York City in the 1970s. The 50s also saw success for Mexican ranchera divas, while a Mexican-American mariachi scene was developing on the West Coast, and Puerto Rican plena, Brazilian bossa nova and other Latin genres became popular.

Mexican-Texans had been playing conjunto music for decades by the end of World War 2, female duos created the first popular style of Mexican-American music, música norteña. Mexican romantic ballads called bolero were also popular, especially singers like the Queen of the Bolero, Chelo Silva. In the mid-1950s, when Mexican ranchera was used in Hollywood film soundtracks and the upper-class enjoyed stately orquestas Tejanas and conjunto evolved into a distinctively Mexican-American genre called Tejano. Artists of this era include Esteban Jordan, Tony de la Rosa and El Conjunto Bernal.

The 1940s saw a return to the roots of Cajun music, led by Iry LeJeune, Nathan Abshire and other artists, alongside musicians who incorporated rock and roll, including Laurence Walker and Aldus Roger. In the late 1940s, Clifton Chenier, a Creole, began playing an updated form of la la called zydeco. Zydeco was briefly popular among some mainstream listeners during the 1950s. Artists like Boozoo Chavis, Queen Ida, Rockin' Dopsie and Rockin' Sidney have continued to bring zydeco to national audiences in the following decades. Zydeco shows major influences from rock, and artists like Beau Jocque have combined other influences, including hip hop.