Imagine turning out four of the most successful and groundbreaking heavy metal/blues-rock albums of all time, only to go on turning out more outstanding material. Very few bands in history have consistently delivered mind-blowing albums one after the other for an extended period of time the way Zeppelin has. Zeppelin had invented the sound of the decade, and by 1973, they were really ready to spread their wings (as if they hadn't already).
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[youtube http://www.youtube.com/watch?v=YcSpIOTtWpk]