This song kept going through my mind (not a bad poker song for listening to during freerolls so I looked for it on Youtube. Strangely enough I couldn't find the original Bob Dylan version (probably a copyright issue).

This is a pretty nice version, Phil Lesh doing the vocals the way he used to do with the Grateful Dead. If I had my life to do over, I would spend it hanging out with those Mill Valley stoners (the academic rat race is just too hard a road to face, if you knew what it would be like ahead of time