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.
Disturbed: Defying Genre. The band Disturbed is something you might, at first, not expect to read about in these pages. Disturbed is not classic rock per se, but in their unique way they have managed to perfect a classic sound, which has always distinguished them from normal metal fare. In some ways they remind me of a modern Judas Priest. That is because of one main element and most important ingredientâMELODY.