If you were a 12-year-old boy just getting into this band, this is exactly what you needed to hear to know this band was for you. If you are a 40-year-old man who never stopped liking them, this is all the proof you ever needed that your fandom was the right decision. Led Zeppelin was not always perfect, nor did they always make the right choices, but here in the confines of these four and a half minutes they were, and they did.