(Photo by Dimitrios Kambouris/Getty Images)Few songs in classic rock hit as hard out of the gate as Heart’s “Barracuda.” At the time, sisters Ann and Nancy Wilson were romantically involved with band members Michael Fisher and Roger Fisher, who were also brothers. Rather than writing a response in an interview, Heart answered with one of the fiercest rock songs ever recorded. Musically, “Barracuda” is built around one of the most recognizable guitar riffs in rock history. Nancy Wilson’s aggressive rhythm guitar combines with Roger Fisher’s soaring lead work to create a driving, almost metallic sound that was ahead of its time.