The documentary itself is very straightforward, indulging in scratch techniques only a few times (thankfully!). This slightly restrained approach makes the whole thing more effective and informative, although it limits its artistic value as cinematic art. But it does let the personalities of the artists come out in all their glory. Some of these people are hilarious, larger-than-life characters, and watching them talk about jiggling vinyl discs on a turntable seems quite silly at the beginning until they prove their mettle in front of us. The sounds and rhythms are energetic and often beautiful, and watching these artists experiment and come up with new techniques is fascinating. It's also thoroughly educational for outsiders who don't understand, for example, the difference between a DJ and an MC. But to be honest, this couldn't have been a terribly difficult film to assemble; it doesn't have the sweep of depth of a truly great documentary. And it feels like a 30-minute short stretched over 90 minutes with a lot of performance stuff and self-indulgent clips that reinforce at every turn just how vital and important this music is. Which is something we might take more seriously, perhaps, if it was less focused on DJ battles and more centred on making music.