Dimebag Darrell's fusion of chaotic thrash and classic hard rock helped shape American metal. While the late guitarist's sharp, screaming riffs on Pantera's “Cowboys from Hell” launched groove metal, the chugging “I'm Broken” reveals Southern rock's impact on his greasy attack. During his tenure in Damageplan, he employed jagged syncopation to churn out choppy nu-metal jams like “Save Me.”