Jeff Beck's bold innovations are central to hard rock's evolution. Two of his first disciples are Joe Perry, who weaves the Brit's spacey talk box into Aerosmith's boogie beast “Sweet Emotion,” and Duane Allman, whose weepy fuzz in the jazzy “Dreams” echoes Beck's guitar effects. Joe Satriani's manically squawking “Surfing With the Alien” is proof that Beck's eccentric harmonics and feedback are building blocks for instrumental hard rock.