Southside has been played over 20 times on NTS, first on 5 February 2018. Southside's music has been featured on 25 episodes.

Southside, born Joshua Luellen, is an Atlanta-based super-producer and one of the architects of modern trap music. Rising from the underground with his dark, aggressive sound, Southside became a founding member of the influential production collective 808 Mafia, a group that helped redefine hip-hop’s sonic direction in the 2010s. Known for his hard-hitting drums, eerie melodies, and cinematic energy, Southside’s production style is instantly recognizable. He played a major role in shaping the sound of trap’s biggest era, contributing to chart-topping records for artists like Future, Waka Flocka Flame, Gucci Mane, 21 Savage, Travis Scott, Lil Baby, and Young Thug, among many others. Southside’s breakthrough came through his long-running collaboration with Waka Flocka Flame, where his raw, high-energy beats helped fuel the rise of aggressive Southern rap. From there, his influence exploded globally, with his beats becoming staples on platinum albums and major festival stages. Beyond production, Southside is also an entrepreneur and mentor, using 808 Mafia as both a creative hub and a launchpad for the next generation of producers. His impact stretches far beyond individual hits — he helped set the blueprint for modern trap production and continues to push the genre forward. Still evolving, still loud, still unapologetic — Southside remains a cornerstone of contemporary hip-hop culture.