From David Gans:

I sent the Tossi Aaron "Rider" and "Fennario" to Bob Weir today,
asking if he thought they might have influenced Jerry's versions.
Here's what he said:

>I never heard these recordings, but they were typical of the current
>versions of these songs at the time of their release. I heard
>folkies doing these songs this way back in the early 60's, though
>1960 was a bit before my time. Sounds like Tossi Aaron could have
>been an early inspiration for Joan Baez.
>
>Jerry could have picked up his versions of these tunes from these or
>any of a number of other similar versions.
>
>Cheers,
>Weir