Your attitude towards the music does you credit, but honestly you need a more diverse background in popular music knowledge before making statements about Deathcore bands being the only musicians to use exotic scales & odd time since the romantic period.
I thought it was particularly naive of you to describe non 4/4 time as 'rare' & 'much forgotten'. I can think of dozens of non metal songs off the top of my head that have odd time, & polyrhythms. In fact, as Blackmetalwhiteguy pointed out, 3/4, 5/4 & 7/8 aren't especially strange. There have been non-metal, chart topping hit singles in time signatures like those.
Also, you have to realise that there is an art to using odd time. As a musician, its very easy to play 5/4 & have it sound like 4/4 with an awkward extra beat tacked on the end. The skill comes from being able to write music in odd time that flows naturally, & melodies that respect note groupings in odd time. Anyone can write a breakdown in 3/4, the much forgotten part is how to make it breathe, its a skill that you dont see all that much in metal bands that use odd time.
& harmonic minor is hardly exotic. If anything its over used within the context of metal.
Also death metal harmony is generally not very complex. I can think of comparitively few DM bands that use Chord extensions to the 7th & very few at all that use compound intervals.
Compared to something like Jazz, even the more basic forms of Jazz & Jazz influenced pop, metal is generally harmonically sparse.
Finally, I cant see any Deathcore bands having lyrics to compete with Byron & Keats. You can make a point about intelligent lyrics in metal without making such a hyperbolic statement Im sure.
Nice try dude, but being as polite & constructive as possible, your essay isnt especially well informed or objective.
http://factoidz.com/the-new-musical-sophistication-of-the-death-metal-genre/
