Not sure of the exact date--spent the early evening at the munich hofbrauhaus doing dinner and boilermakers. Stumbling back to the hotel (w/5 fellow graduates & high school lit. teacher), heard some amazing rock music coming from around the corner, followed it to a club called the Blow-up where we paid I think about 3 marks (a dollar) but not more than 5 cover charge. Music stopped as soon as we walked in the door, so we ordered another round of boilermakers awaiting the next set. Guy appeared on the fire escape lookin structure above the stage, and like a monkey climbed his way down to where he was hanging by his hands, dropped the last 10 ft. or so to the stage taking his position behind the drums (bruford). His bandmates filed in stage right. First tune of the set was a Beatles cover (can't remember which). Wow. Crisp sound, great arrangement (at that time, even attempting a Beatles tune took major cajungas ) . We'd just been blown away in July at Royal Albert Hall by Led Zepplin returning from their first American tour, another great concert including tunes off their not yet released 2nd album ("here's a song we haven't named yet..."--turned out to be The Lemon Song). Anyway, Yes was so much more dynamic and interesting, a sacreligious confession since zep was my favorite band at the time--Yes was a totally different rock sound, my first exposure to progrock. Got back to socal a few weeks after and discovered this 'unknown' group we stumbled onto had released their first album. Only serious regret of that europe trip was having missed the Stones' and Blind Faith's free concert in Hyde Park (by one day) but I'd be a dick to complain.