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.
Grime (music genre) - Musical style. 1  Grime is typified by complex 2-step, 4x4 breakbeats, generally around 140 beats per minute, or sometimes structured around a double-time rhythm, and constructed from different synth, string and electronic sounds.