"Almost parallel to the first Rock’n Roll stars and their society, the union of Rock with Jews didn’t come so smoothly, it was a rocky road at first, particularly in the years roughly from 1973-1982. Jewish music didn’t catch up with the rest of the world so fast. I remember one time we were doing a concert at the Jerusalem Theater and after the show someone comes up to us and emotionally expressed his disapproval of the Holy words being fused with rock sounds (Elvis and Ray Charles got the same reaction)."In addition to his version of the history of DYB (which is a bit different than Roensblum's version) it includes this fantastic "Genealogy of Jewish Rock."
It's a bit idosyncratic, but hey...it's good fun none-the-less. I haven't been able to find a video of DYB playing, and Ruby Harris's videos focus on his other music interests. But here's Avraham Rosenblum, father of Jewish rock, in action.