▁in ▁heavy ▁hard core ▁tend ▁to ▁be ▁st acc ato ▁low - end ▁musical ▁breaks . ▁According ▁to ▁writer ▁Brian ▁J . ▁Koch an , ▁heavy ▁hard core ▁" emb ra ces ▁the ▁myst ique ▁of ▁the ▁g rit ty ▁and ▁hard ▁working ▁class ▁lives ▁of ▁those ▁in ▁America ' s ▁big ▁cities ". ▁W riter ▁Kevin ▁War wick ▁of ▁Band camp ▁described ▁break down s ▁in ▁heavy ▁hard core ▁as ▁" thick ▁pal m - m uted ▁rh yth mic ▁guitar ▁jog ging ▁alongside ▁the ▁clicking , ▁pin point ed ▁thr um ▁of ▁a ▁double - k ick ▁ped al ▁and ▁quarter - notes ▁on ▁the ▁crash ". ▁Punk news . org ▁described ▁heavy ▁hard core ▁as ▁" he avy ▁break down s , ▁grow ly ▁vocals ," ▁and ▁" the ▁occas ional ▁metal ▁r iff ". ▁ ▁History ▁ ▁Pre de cess ors ▁( 1 9 8 0 s ) ▁ ▁After ▁the ▁beginning ▁wave ▁of ▁hard core ▁punk ▁ended ▁during ▁the ▁arrival ▁of ▁the ▁ 1 9 9 0 s , ▁influ ences ▁from ▁different ▁social ▁movements ▁and ▁musical ▁movements ▁divers ified ▁the ▁hard core ▁punk ▁genre . ▁A ▁notable ▁example ▁is ▁straight ▁edge , ▁a ▁hard core ▁punk ▁sub c ulture ▁in ▁which ▁involves ▁avoid ing ▁alco hol , ▁to b acco , ▁and ▁other ▁recre ational ▁dru gs . ▁Another ▁notable ▁example ▁is ▁youth ▁crew , ▁a ▁music ▁sub c ulture ▁of ▁hard core ▁punk ▁that ▁emer ged ▁with ▁bands ▁such ▁as ▁Youth ▁of ▁Today ▁and ▁Ch ain