▁of ▁Str ength . ▁This ▁helped ▁make ▁the ▁heavy ▁hard core ▁genre ▁a ▁notable ▁genre ▁of ▁hard core ▁punk . ▁The ▁New ▁York ▁hard core ▁band ▁Ag nost ic ▁Front ▁also ▁p aved ▁the ▁way ▁for ▁heavy ▁hard core . ▁Another ▁New ▁York ▁hard core ▁band ▁that ▁p aved ▁the ▁way ▁for ▁heavy ▁hard core ▁is ▁the ▁Cro - M ags , ▁whose ▁album ▁The ▁Age ▁of ▁Qu ar rel , ▁released ▁in ▁ 1 9 8 6 , ▁set ▁the ▁prototype ▁for ▁heavy ▁hard core . ▁Other ▁New ▁York ▁hard core ▁bands ▁that ▁p aved ▁the ▁way ▁for ▁heavy ▁hard core ▁include ▁War zone ▁and ▁S ick ▁of ▁It ▁All . ▁C ros so ver ▁thr ash , ▁a ▁genre ▁with ▁elements ▁that ▁were ▁used ▁by ▁heavy ▁hard core ▁band ▁Mad ball ▁to ▁help ▁launch ▁the ▁heavy ▁hard core ▁genre , ▁also ▁p aved ▁the ▁way ▁for ▁heavy ▁hard core . ▁Ex amples ▁of ▁early ▁c ros so ver ▁thr ash ▁bands ▁are ▁D . R . I . ▁and ▁Su ic idal ▁T endencies . ▁ ▁Orig ins ▁( late ▁ 1 9 8 0 s ▁and ▁early ▁to ▁mid - 1 9 9 0 s ) ▁ ▁The ▁New ▁York ▁hard core ▁band ▁K illing ▁Time ▁is ▁considered ▁one ▁of ▁the ▁earliest ▁heavy ▁hard core ▁bands . ▁K illing ▁Time ▁released ▁its ▁debut ▁album ▁Bright side ▁in ▁ 1 9 8 9 . ▁The ▁album ▁has ▁been ▁compared ▁to ▁the ▁heavy ▁metal ▁band ▁Met all ica . ▁During ▁the ▁late