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.
Groove (music) For a music streaming service called Groove Music, see Groove Music. Funk music such as the type performed by groups like Parliament Funkadelic uses catchy electric bass lines and drum patterns to create a propulsive, emphatic rhythmic feel that is often referred to as a groove.