When 2
Sound Systems roll up aside each other and both
deejays rap and joke or insult the other system while playing better music in a battle metality. Since Sound systems were often run by gangsters, things used to get out of hand, with firearm ammunition going through bass coils.
A purely
Jamaican tradition that sparked the beginnings of both
Dancehall,
Dub,
Ska and
Reggae.