Easy Screamo Licks, little help here writing my own stuff Options

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Hi I'm wondering what scale most of the screamo stuff is in like "underoath" the used and Fall out boy they all have super easy riffs that repeat through most of the song if i was looking to write my own type of stuff like that what key is it normally in and what scales do they usually use. this is my first post so go easy on me.
thanks!

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