This thread is fascinating.

On a slightly different tack, what do you think "rider" means? Horseback? Is it sexual? Does it refer to a particular lifestyle/job? Is there any cultural context?

I'm so glad to know that it was originally from a woman's point of view... it sort of makes more sense to me now that way. I first heard the Byrds recording of this song... and the Jorma Kaukonen version sometime thereafter.