Without resorting to technicality we describe the structures behind death metal, black metal, heavy metal and crossover metal style and compositional media. We recognize that genres are "containers" for stylistic and compositional tendencies which reveal the interpretative structures in the music evoking the larger meta-perception or "life philosophy" beneath.
Aesthetic -- or styles, arrangement, and production decisions -- "works" where it supports the internal compositional structures of whatever music it encloses. With metal the question is of accepting the reaction of despair to the violence and paranoia and insanity of human world living in denial of fear/death, and turning it into a living, willful, and distinctive nihilism that affirms nothingness as a gateway into more profound realms of thought.
Rhythm
Syncopation
By playing off of internal rhythms, metal bands achieve syncopation -- the inversion of stress in a passage. Normally strong beats are weak and the weak are strong; this effect is often achieved through polyrhythmic overlay by double-bass in death metal bands or by the chaotic, threshing blast beat of blackmetal drummers.
Polyrhythm
Using multiple rhythms to enhance layering effects bands create multiple dimensions of rhythmic space, using a normally linear framework in new shapes and often long or indeterminate phrases. This can occur in the dominant rhythmic instrument (guitars) or the background rhythm (drums/bass).
Some bands have taken this to extremes of chaos piling into itself, revealing an inner consistency and beauty, where others have interpreted this in the way of more contemporary ambient composers and have layered counterpoint or complementary rhythms in complex neo-electronic compositions.
Percussion
Explosive or definitive notes in a phrase are accentuated by percussion in drums or stringed instrument. Most often in guitars this occurs in the bands who muffle chords and strum staccato or interplay phrasing for conclusive effect, more than open-ended styles.
Melody
Consonance
"Normal" melodies are used by older styles of heavy metal and sometimes by progressive bands integrating a jazz or rock influence. They are built around the scales used by these forms of music historically and in present essence, and as such are more easily recognized by listeners familiar with more mainstream music.
Dissonance
Using dissonant alignment of notes in melodies produces a mournful yet technical sound, so many bands use this technique in both melodic and harmonic construction.
More detailed info on this topic can be found here:
http://www.anus.com/metal/about/styles.html
Best Metal Bands
I will add some best metal groups here soon
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