Three songs on 10/10/68 are with an unknown guest on harmonica. Before the Next Time You See Me Jam, Jerry asks if anyone wants to come up and sing and play harmonica. It's determined that someone named Marvin does not have a harmonica, and then someone is found who does have one. The guest then joins in for the next three songs. The unknown guest also sings on Look On Yonder Wall (a Butterfield Blues Band standard).
Previously it was thought that the guest was Paul Butterfield, but it appears that its not based on the harp style and the voice. Its not really clear from the recording if the guest was this Marvin person, someone who was an audience member who just got up on stage and joined in, or someone else. Someone I know locally suggested Will Scarlett as a possibility. Does anyone have an opinion on that? Dave S.
