Dubstep is a genre of electronic dance music originating in South London, England. The music usually features syncopated drum and percussion patterns with bass lines containing prominent sub bass frequencies. Dubstep singles were first released in the late '90s as B-sides of 2-step garage single releases. These tracks were darker than 2-step garage, placing less emphasis on vocals and adding more elements of breakbeat, drum, and bass into 2-step. In 2001, these kinds of tracks were promoted at London's night club Plastic People, a club highly influential to the development of dubstep. BBC Radio 1 DJ John Peel started playing “dubstep” from 2003 onward. In late 2005 and early 2006, dubstep spread beyond small local scenes and entered mainstream British popular culture. At this time, music magazines, such as The Wire, and online publications, such as Pitchfork, wrote about dubstep to increase its popularity. In the late 2000s and early 2010s, dubstep became more commercially successful in the UK, and music journalists and critics also noticed a dubstep influence in several pop artists' work. Around this time, producers fused elements of the original dubstep sound with other influences, creating fusion genres like future garage, post-dubstep, and brostep, the latter of which contributed to dubstep's rising mainstream popularity in the United States.