This happened to me many moons ago (early '70's).  I went to see a band called Winter Consort (great band which begat the equally great 'Oregon' band) at a venue called 'My Father's Place' in Roslyn, Long Island.  It was the middle of the week and the joint was 1/2 empty.  2nd billing was this band from New Jersey that absolutely tore the house down!  One of the greatest live performances I'd ever experienced!  Within 3 months, this band and it's leader were on the cover of Look and Time magazines!  I HAD to own their 1st and only record at the time, and MAN, was it a dissapointment!  IMO it had nothing of what I'd experienced.  Truthfully, I never heard on ANY of their records what I heard that night.  Yeah, I'm talkin' Bruce Springsteen and the E Street Band, the record; 'Greetings From Asbury Park'!