i would suggest either pressure when she starts "I CAN FEEL THE PRESSURE IS GETTING CLOSER NOW WE'RE BETTER OFF WITHOUT YOU....." or Born For This most of it is kinda screamin and especially near the end when Hayley sings "we were born for this...." so yea i hope this helped good luck on singing/screaming
crushcrushcrush is a freakin AWESOME song!! do that one. you need to decide when to scream- that's a personal touch that you add to make the song unique to urself.