Hi! to khong ranh ve Black metal va death metal nen khong tra loi con diem phan biet giua hard rock va heavy metal thi co mot so diem nhu sau: -Ve thoi gian thinh hanh thi hard rock bat dau tu nhung nam cuoi thap nien 60 cho den giua thap nien 70 con heavy metal la su ke thua cua hard rock ,tu nua cuoi thap nien 70 cho den nhung nam 80. -Ve phong cach thi hard rock la nhac blues rock choi voi tiet dieu nhanh va manh,nhung cau riff va lead cua hard rock mang phong cach blues rat dam dac.Con heavy metal thi giu lai tiet dieu cua hard rock ma bo di nhung cau riff theo kieu nhac blues.Heavy metal chu trong ve phan ki thuat pha tieng ,toa am thanh moi nhieu hon. Nhung ban nhac tieu bieu dong hard rock: The Who,Rolling Stones,Led Zeppelin,Deep Purple... nhung ban nhac tieu bieu cho trao luu heavy metal la:Judas Priest,Iron Maiden,Def Leppard,Motley Crue... Barrygibson
