Types of Insomnia. There are two types of insomnia: primary insomnia and secondary insomnia. 1  Primary insomnia: Primary insomnia means that a person is having sleep problems that are not directly associated with any other health condition or problem.
System of a Down's music has variously been termed alternative metal, nu metal, hard rock, progressive metal, thrash metal, art rock and avant-garde metal.
Trap music. Trap music is a subgenre that originated during the 1990s from Southern hip hop in the Southern United States. It is typified by its ominous lyrics and sound that incorporate double or triple-time division hi-hats, heavy kick drums from a Roland TR-808 synthesizer, layered synthesizers, and cinematic strings.