I've loved this song for over 35 years....both Gram's version with the Burrito Brothers (duet with Chris Hillman) and later Emmylou Harris' version with the Hot Band (duet with Herb Pedersen).

Today I stumbled by chance across a version with Gram and Emmylou together....it actually feels like a miniature 'Holy Grail' moment. It was released as a bonus track on a Rhino compilation of GP's work three or four years back.

Anyone registered to Spotify can hear it over there....though rough and ready it's actually rather wonderful. Accompanied only by a solitary acoustic guitar (presumably played by Gram himself)
Sounds as if it was from a radio session somewhere in California on the ill-fated Fallen Angels tour just before Gram died. Some of the time there's a third harmony added by a guy called ND Smart which gets in the way a bit (he sounds as if he's closest to the microphone)