You guys got to get Fleetwood Mac's "Boston Tea Party - Vol 1". This is from January, 1970, and is the original blues group with Peter Green. Excellent sense of a live concert.
By the way, just today I picked up The Best of Traffic, Delaney and Bonnie and Friends, and Deep Purple Live on the BBC which includes "Hush" (the single release, not a live version). Also picked up "The Frost - Live"...see, I'm a Detroit boy.