OK, I gotta get that one; thanks, Greg!
I'm with you Bill; I'd bet $5 Federal that's Nelson singing.
And the author says " the Hart Valley Drifters – featuring with a 20-year old Jerry Garcia on lead vocals, banjo and guitar, were future Grateful Dead co-founder and fellow-lyricist Robert Hunter on bass, New Riders of the Purple Sage co-founder David Nelson on guitar, Ken Frankel on banjo, fiddle and guitar, and Norm Van Maastricht on Dobro."
My Deadhead sensibilities, combined with my natural tendency to pick the fly poop out of the pepper, require me to point out that 1) Hunter was not a Dead co-founder; he came into that about a year in, and 2) they were not "co-lyricists" - Jerry never did a lyric after Hunter started writing them (and we're all glad of that; I think RH should have gotten the Nobel before Dylan, but Jer was not a threat there).
Peter (whose wife assures him is really annoying when he says stuff like that, but can't help himself)