The ISB was a major influence on Jimmy Page and Robert Plant....the recorder duet in the intro to 'Stairway to Heaven' was a direct nod in their direction.
This article from Rolling Stone illustrates the fact:
To his credit, Bill Graham (Rock Impresario who opened the Fillmore East and Fillmore West) has put his 'vault' of recordings on line from those days. Registration is required, but there are some gems there, including this ISB performance from June 5th, 1968
Thanks for the link to the Bill Graham vault.
Thanks too for the Led Zep info also.
If I live long enough, I'll know a thing or two.
The other ISB set in the vault is from the Fillmore West (now the location of a Honda dealership) dated May 11, 1970. My wife and I and our future son ( he born Oct. 12,1970) went to see them that night. The room was so full of grass smoke, you'd have to use an aqualung to not get high. Good times. Pete Grant played with them that night (along with Rose, Licky, Michael, Robin). Loads of SF Org staff were there. A very fun evening. The band had done the solo course at ASHO when my wife was the solo course sup.