#2
I've never heard the music, but I used to listen to hardcore music, and they just used the standard western harmony that everyone else uses ha.

If you learn a few of their songs by ear and learn the chord progressions and cadences, you'll begin to develop an ear for it and recognize the patterns that occur.
And we will weave in and out of sanity unnoticed
Swirling in blissfully restless visions of all our bleary progress
Glowing in radiant madness
#3
Most screamo makes frequent use of open strings, minor progressions (often octatonic), and b5 chords.
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