Oooooo, am I the first to vote?
Oh, thank you MrDayC this was a very special treat for me to listen to all of these versions, most for the second (cough) time.
I'm afraid I'm at an empasse as I find it very difficult to decide so I'll look at it this way:
on a scale of 1-10, 10 being the best
Original, Bob Dylan
one of the greatest "folk" writers/musicians of my generation and perhaps of all time. He does deserve recognition but the harshness of the harmonica is hard for me to suffer through. I also find it difficult to appreciate his singing voice.
I give the original an 8.
Cover #1 Jimi Hendrix
His version defines the "psychodelic" rock music that emerged from the first "Wood Stock" and is the most influential version defining the "Viet Nam" era. I don't think his improvisation is the best though when compared to the next 4 versions. He gets a minus on vocals and guitar.
I give improv #1 an 8
Cover #2 XtC
This version defines the emergence of "break-out" or "alternative" rock. The vocals are a little harsh but the guitars and drum balance it and I really like this improvisation so,
I give improv #2 a 9
Cover #3 Grateful Dead
This version defines the mello end of the alternative scale of rock hence the "dead-head" reference to describe the fans. The vocals are weak but the guitar is strong and I like this version so,
I give improv #3 a 8 1/2
The real contest for me and what's giving me such a tough time deciding who's best are:
Cover #4 Dave Matthews
I find absolutely nothing wrong with this improv. The vocal is strong and the guitar is superior so,
I give improv #4 a 9 1/2
Cover #5 Michael Hedges
I was knocked out with his intro and I find myself wanting to actually buy his music, today! So I give improv #5 a solid 10. Truly outstanding improv and far surpasses the original.