Japan is producing some of the world’s most vital techno, though its roots go way back to the late 1970s. We talk to some of the country’s producers, DJs and musical advocates to find out what makes the Japanese underground so exciting...

Roland’s 909 drum machine is responsible for the rhythm of house and techno, and countless classics of dance and pop. Exactly 35 years after its launch, we delve deep into the device, learning how it laid the foundations of modern club music, and how it still exerts a strong influence now