Tout est possible, tout dépend du résultat recherché par tes oreilles.
Vas voir comment sont construites les pièces que tu aimes par exemple. Tu peux éventuellement demander quel mode est utilisé dans tel morceau de trash/metal.
Cherche du côté des analyses musicales du metal... par exemple :
Citation:
Thrash Metal
Thrash metal (a faster style of thrash metal is known as speed metal) is a heavy metal derivative, played at high speed and aggression.
It is characterized by use of pedal notes and speed-picking or strumming of these or power chords based on these roots. Thrash came when scene kids in the bay area wanted to feel big, and combined British hardcore punk rock and New Wave British heavy metal. Thrash metal originated from the Bay Area of California, with bands such as Metallica and Exodus, from L.A., Slayer & Megadeth, and from New York, Anthrax, pioneering the sound. Metallica, Megadeth, Anthrax and Slayer are often referred to as the "Big Four" of thrash metal. Other early bands include Exodus, Testament, Overkill, etc. Other honorable mentions include Kreator, Sodom and Destruction, who are sometimes referred to as "The Unholy Trinity" of German thrash metal. The thrash metal band Possessed is known to pioneer the death metal genre. Examples of thrash metal classics are, Anthrax's Caught In A Mosh, Megadeth's Holy Wars, Metallica's Battery, and Slayer's Angel of Death. Many thrash bands like Destruction, Vio-lence, Kreator, Death Angel, Dark Angel, Megadeth, or Testament had a more technical side to their music. Testament's lead guitar work was influenced by jazz, Destruction's and Megadeth's by classical music.
Most thrash songs use methods like palm muting, fast paced tremelo picking, fast double bass blast beats, minor scales, blues scales, or tapping. Thrash was mostly influenced by hardcore punk, and some thrash bands like DRI, Suicidal Tendencies and Municipal Waste have added a little more punk influence and created Crossover Thrash.
The riffs are very fast, solos a little short and simplistic, fast paced shouting, and most songs are in either e minor or d minor.
http://en.wikibooks.org/wiki/M(...)Metal
Comme tu peux lire, le sujet est vaste, et un peu comme le jazz, ce n'est pas tant une question de modes que d'accumulation de façons de faire.