I've got an excellent soundboard recording of a show by a band called steel mill (led by a 20 year-old bruce springsteen) from SF 1/13/70.
It's heavy blues-based hard rock with a psycacdellic jefferson airplane edge. It's very good. I'll make some copies for those who are interested. pm me your mailing address if interested.
This is where bruce made his mark as a guitarist long before he got famous.