Question 6 of at most 6 leading so far, Cybergrind
Do you want a tune you could hum afterwards?
The third rating, and the one that most often separates two genres the first two cannot.
Hear the difference
One tenor overdubbed into a congregation, against a guitar picked fast enough to stop being notes at all.
- The choir from 1:07
Helloween - Keeper of the Seven Keys Part II
Every chorus line multi-tracked into a wall of the same voice. The genre's characteristic sound is not the guitars but this - one tenor overdubbed until he is a congregation.
Open on YouTube at 1:07 - Tremolo as texture
Morbid Angel - Altars of Madness
One note picked as fast as the hand goes, so what reaches you is not a sequence of notes but a single wall with a pitch. Thrash picks fast to be percussive; this picks fast to stop being percussive at all.
Open on YouTube
Both are sound passages from the genre pages, cued to the second. Nothing reaches Google until you press play.
Asked because your answers so far leave the top 20 genres close together, and of the questions left this is the one that divides them most evenly. That is enough, show me the answer.