Metal bands began to look further from the blues scale that Black Sabbath used and went on to use diatonic modes. This sparked a new phenomenon that spread through nearly all of the sub genres of metal.
In the 80s, the sub genre of thrash metal evolved into death metal. Some of the prominent death metal bands of that time were Possessed and Death. Traditional metal also began in the 80s and bands like Fates Warning and Queensrysce were accepted into the mainstream of music.
More sub genres of metal surfaced quickly in the 90s, including Stoner Metal and Sludge Metal.
Sub Genres Of Metal Music:
Metal, much like rock, is made up of many sub-genres. Metal genres can at times be difficult to differentiate as they seem similar but have small changes in overall structural, temperamental, instrumental and vocal changes. This is made even more difficult to differentiate, as often sub genres are similar to each other in other genres.
Black Metal: Black metal evolved from thrash metal. Black metal is not as cold and brutal as thrash, although it is still considered to be an extreme genre. The sound is a combination of tremolo bass and vocals are usually screamed or yelled by performers. Themes of Black metal are usually supernatural or occult in nature.
Doom Metal: Doom metal emphasizes emotion, melancholy and depression. Tempos are usually slower with somber harmonies. Doom metal has the same type of vocals as death and black metal. Classical instruments are also used a lot in Doom metal to enhance the mood of the music.
Folk Metal: Folk metal started out as a fusion of folk rock, power metal and black metal. Now it is a term given to folk-themed bands that use folk based lyrics and themes, including instruments.
Glam Metal: Glam metal was popular in the 80s and was also known as hair metal. Many of the band members used makeup, similar to the 70s glam rock bands and Idols such as Alice Cooper.
Gothic Metal: Goth Metal had the same style as doom, black and death metal, but used heavy keyboard sounds with romantic story like words. Goth metal often used two vocalists.
Grindcore: Grindcore is like thrash metal with tones of hardcore and punk. Vocals are a lot like death metal and the songs tended to be very short. Grindcore today is mostly influenced by death metal.
Heavy Metal: Heavy metal is the origin of the genres and where metal music got its name. Loud rasping vocals and long solos with the guitar characterize heavy metal. The words of the songs are often unfocused on any particular theme.
Industrial Metal: Industrial metal uses Distortion of guitar sounds, synthesizers and drum machines. Industrial is heavily influenced by techno and industrial music.
Metalcore: Metal core bands use the vocals and beat of American Hardcore metal with the instruments, such as guitars that are used in European thrash metal.
Neoclassical Metal: Neo-Classical uses parts of classical music in normal metal music.
Nu Metal: Nu Metal has very little to do with heavy metal and is largely influenced by Hip Hop.
Power Metal: Power metal is more upbeat and uses clear vocals. Power metal uses science fiction or fantasy themes and is inspiring to the listener.
Progressive Metal: Progressive metal is sophisticated and complex. Vocals are clean and often lean towards philosophy or politics. Progressive metal is very much like progressive rock.
Thrash Metal: Thrash Metal is heavy metal combined with hardcore punk. Thrash is usually complex with many tempo add time changes. The words are usually yelled, although they remain in tune and melodic. Thrash was also the first metal genre to use double bass drums in their music.
