Grime music emerged at the turn of the millennium in the United Kingdom. Performed by MCs and DJs, it is a vital and vibrant form with unrelenting energy. This chapter focuses on live collective performance in grime music. In particular, it explores the spaces where grime is performed, paying attention to the specificity of these contexts, and their impact on group practice. It is split into three sections. Firstly, it positions grime as genre, demonstrating how antecedent forms—principally hip-hop and Jamaican dancehall—inform its collaborative, yet competitive nature. Secondly, it will offer an overview of these key arenas (radio, raves, record shops), unpacking how grime thrived within a “Black Public sphere” outside of heavy censorship and racialised policing of mainstream public fora. Finally, it will focus on a performance that captures grime’s improvisatory framework. Taken from 2007, this acclaimed “Birthday Set” for East London MC Ghetts possesses many hallmarks of grime performance. The analysis addresses competitiveness within MCs, intergeneric allusions (lyrical or otherwise), and the DJ’s technical cachet. This chapter therefore demonstrates dense interconnectivity within grime’s contexts for performance, offering insight into the ways in which the live domain acts as the pivotal ground for new creative work.