Country musicians began recording boogie in 1939, shortly after it had been played at Carnegie Hall , when Johnny Barfield recorded "Boogie Woogie". The trickle of what was initially called hillbilly boogie, or okie boogie (later to be renamed country boogie), became a flood beginning in late 1945. One notable release from this period was The Delmore Brothers ' "Freight Train Boogie", considered to be part of the combined evolution of country music and blues towards rockabilly . In 1948, Arthur "Guitar Boogie" Smith achieved top ten US country chart success with his MGM Records recordings of " Guitar Boogie " and "Banjo Boogie", with the former crossing over to the US pop charts.  Other country boogie artists included Moon Mullican , Merrill Moore and Tennessee Ernie Ford . The hillbilly boogie period lasted into the 1950s and remains one of many subgenres of country into the 21st century.
Ky Rodgers says that one night when riding in a street team van, the vehicle was in an accident in Utah, and the van fell off a three-story cliff. Ky was severely injured, and had to be care flighted to a hospital. He broke his L2, L3, and L4 vertebrae, his pelvis and sacrum, and was in the hospital for a week before he was discharged. He claims that Mikel Knight completely abandoned him and the rest of his street team crew, did not pay them, and would not return their personal possessions. Ky was stuck with $38,000 in medical bills, and couldn’t get Mikel Knight to even work with the auto insurance company to take out a claim, if the van was ever insured in the first place. “There was nothing we could do because we never signed anything saying ‘hey, you’re hired!’ He leaves no paper trail, no proof that anyone works for him, and he never withheld taxes from anyone’s pay.”
The lyrical content of many early rap groups focused on social issues, most notably in the seminal track "The Message" by Grandmaster Flash and the Furious Five , which discussed the realities of life in the housing projects.  "Young black Americans coming out of the civil rights movement have used hip hop culture in the 1980s and 1990s to show the limitations of the hip hop movement ."  Hip hop gave young African Americans a voice to let their issues be heard; "Like rock-and-roll, hip hop is vigorously opposed by conservatives because it romanticises violence, law-breaking, and gangs".  It also gave people a chance for financial gain by "reducing the rest of the world to consumers of its social concerns."