The borders between London’s musical tribes have always been porous. For Yussef Kamaal, the sound of the capital – with its hum of jungle, grime and broken beat – has shaped a self-taught, UK-tipped approach to playing jazz. In the states, the genre’s long-running to-and-fro with hip hop – from Robert Glasper to Kamasi Washington – has reimagined it within US culture. On Black Focus, Yussef Kamaal frame jazz inside the bass-saturated, pirate radio broadcasts of London.