The Grateful Dead, Quicksilver, Country Joe And The Fish, The Jefferson Airplane...they all were rotten, no-playing, pretentious, poorly produced bands. Although the Airplane can be forgiven a little because they sounded like they wanted to actually make statements, inane as they were.
If you want to hear really great music from the era, look toward Detroit, Memphis, New York and England.
Or the South, the Allman Brothers could kick any of those San Francisco bands off the stage.
Again, I think that it was the drugs. I've always wondered what the Jefferson Airplane (and Hot Tuna) would have sounded like had Jorma and Jack been sober!
It would have been amazing.
Mark