The first Led Zeppelin US tour kicked-off almost a month before the release of the group's self titled debut album served notice that the band would become much bigger than most of the groups it was opening for.  The mighty Zep blew the doors off just about every headline act, no doubt resulting in some awkward scenes backstage and irate phone calls to managers.  Audio from one of the early dates on the tour, a December, 30 1968 concert at Gonzaga University in Spokane, WA posted on YouTube gives a pretty good indication of just how intense Zeppelin was just a couple of months after its first official gig as a band.
 MusicRadar.com
 
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