Joshua Howard Luellen, known professionally as Southside, is an American record producer, rapper and songwriter. Based in Atlanta, he is recognized in the music industry for his aggressive, trap-infused production work for prominent hip hop artists. His production work for hometown rapper Waka Flocka Flame led Luellen to sign with his label Brick Squad Monopoly, an imprint of Gucci Mane's 1017 Records as in-house talent in 2010. Luellen and labelmate, fellow producer Lex Luger established the production team 808 Mafia that same year, which has been credited on commercially successful releases throughout the remaining decade.

Trap is a subgenre of hip hop music that originated in the Southern United States, with lyrical references to trap starting in 1991 but the modern sound of trap appearing in 1999. The genre gets its name from the Atlanta slang term "trap house", a house used exclusively to sell drugs. Trap music uses synthesized drums and is characterized by complex hi-hat patterns, snare drums, bass drums, some tuned with a long decay to emit a bass frequency, and lyrical content that often focuses on drug use and urban violence.