In 2011, Dubstep gained significant traction in the US market by way of a post-dubstep style known as 'brostep' with the American producer Skrillex becoming something of a figurehead for the scene. In September 2011 a Spin Magazine EDM special referred to brostep as a "lurching and aggressive" variant of dubstep that has proved commercially successful in the United States. Unlike traditional dubstep production styles, that emphasize sub-bass content, brostep accentuates the middle register and features "robotic fluctuations and metal-esque aggression." According to Simon Reynolds, as dubstep gained larger audiences and moved from smaller club based venues to larger outdoor events, sub-sonic content was gradually replaced by distorted bass riffs that function roughly in the same register as the electric guitar in heavy metal.