When Jamaicans emigrated to the United Kingdom, the sound system culture followed and became firmly rooted in the country from the 1970s. In Jamaican popular culture, originaly, a sound system is a group of disc jockeys, engineers and MCs playing ska, dub, rocksteady or reggae music. Dub music grew out of reggae in the 1960s, and is commonly considered a subgenre, though it has developed to extend beyond the scope of reggae.