You've heard it. You know it, even if you don't. It's made you move. It's the mothership of synths — the Roland TR-808 drum sequencer. As an instrument, it has been responsible for shaping the sound of everything from hip-hop, to dance, to pop. It's nearly as ubiquitous as the guitar. Without it, the last 30 years of music wouldn't be the same. Coming December 9, 2016.