I first heard his song after Tom Rush recorded it, and loved the song. I never Joni Mitchell play it, but I also saw Tom perform the song at two different shows, in two different decades, and both times, the arrangement blew me away. He played in the 70's with a gifted guitar player named Trevor Veech (sorry for the spelling). Trevor did some magic guitar work on his telecaster (or was it a strat). I'd love to hear the other versions by other artists.