#2
No not really... But your thread is in the wrong place. S&L is to do with lyrics...

Anyway before you write a Metalcore type song I just suggest you do a few covers of metalcore songs. They pretty much use the same notes (atleast the ones I've heard) and you'll pick up the rhythms quite quickly.
#3
Depends on what style of Metalcore you're looking for.....If you want really generic Metalcore just tune to Drop C, chug the would-be E string a lot, use hammer-ons and pull-offs of about 1 1/2 steps......
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brot pls