One of my fondest memories of my time at UT is when he came into KVRX for a small SXSW performance. It was one of our DJs, him, and his guitarist in the booth and he gave an incredible performance live on the air. You could tell that he'd been through some **** and was channeling it through music. Here's the clip:
There was a fair amount of of experimenting in music in the 60's, but Sabbath, Led Zeppelin and Deep Purple do seem to be recognized as Leaders or the end result of that Evolution. Perhaps - probably Hendrix belongs with them as well. Some early Rockers, Blues Rockers, Garage Rock, Proto Punk ... Yardbirds The Animals (Eric Burdon) The Sonics MC5 Cream Fleetwood Mac (Early Years With Peter Green) Iggy Pop and the Stooges GFR (Grand Funk Railroad) I won't say that the above are Forefathers of Hard Rock, but they tended to have more of an Edge than other bands from that Era.