This is what we found on Wikipedia regarding the Knucks:

Southern hip-hop or Southern rap, also known colloquially as Dirty South music, is hip-hop music from the Southern United States. As hip-hop spread beyond its origins in New York City, several Southern cities began developing their own hip-hop scenes in the 1980s. After some early commercial successes like 2 Live Crew and the Geto Boys, Southern hip-hop broke into the hip-hop mainstream more fully in the 1990s, spurred on by acts like Atlanta's Outkast and New Orleans' Master P and Juvenile. This growth continued in the twenty-first century, making the South into one of the most prominent regions in hip-hop.

Southern hip-hop encompasses a wide range of styles, including subgenres such as trap, crunk, and bounce, among others. Typical characteristics of the Southern hip-hop sound include a focus on bass-heavy beats; relatively little use of sampling, in favor of live or synthesized instrumentation; and a decreased emphasis on lyrical complexity, instead incorporating other vocal styles such as call-and-response chants or heavily processed singing. Much Southern hip-hop is targeted toward environments like nightclubs, and popular dances such as twerking have emerged in close connection with the genre.

The most prominent cities in Southern hip-hop include Atlanta, Houston, New Orleans, Miami, and Memphis. Many of these cities' hip-hop scenes were initially ignored by major record labels; instead, Southern hip-hop has a strong tradition of launching local independent labels, such as Houston's Rap-A-Lot and Swishahouse or New Orleans' No Limit and Cash Money. Southern hip-hop artists have also been quick to embrace novel distribution methods, such as mixtapes or Internet platforms such as SoundCloud, to release music outside of the traditional record label ecosystem.