Dubstep

Dubstep (also known as dubstep remix or remix dubstep) is a genre of music that started in South London, it drew influence from 2-step garage, dub, drum and bass, grime and reggae. A popular dubstep producer Skrillex changed the genre into something much heavier with more growls, gritty basslines and fat sub-basses. 
Since then, the dubstep scene has changed a lot with dubstep going from the underground genre that it was to a mainstream one. It has been played on big festivals, like Ultra Music Festival and Lost Lands.
Characteristics.
Dubstep is usually instrumental. Its tempo usually ranges between 138 to 150 beats per minute. Many songs have two bass drops, where a switch of rhythm and/or bass line occurs and usually follows a recognizable build section and break.
A style of Americanized, heavier and aggressive form of dubstep is referred to as brostep, which has become very popular. It was started by Skrillex..