If you are of a "certain age" (and you know who you are) then you will appreciate this site I am about to lay on you: http://concerts.wolfgangsvault.com/
Wolfgangs Vault (www.wolfgangsvault.com) is the brainchild of Bill Graham,the pre-eminent concert promoter of the 60's and 70's. From the site:
Wolfgang was Bill Graham, the man whose genius for bringing performer and audience together shaped the rock concert as we have come to know it. Born Wolfgang Grajonca in Berlin in 1931, he escaped Nazi Germany to grow up in a foster home in the Bronx and anglicized his name at the age of 18. Bill Graham, who would come to be known as the midwife of the modern rock concert, was smart and forward-thinking, an opportunist and a listener, fair and ferociously demanding, and he remembered his roots: in the 1980s he opened a small San Francisco club and named it Wolfgang's.
This site allows one to stream live concert audio from some of the best live rock shows of that period.
It's free, just give them your email address and a password and you're in. You can thank me for this later.