David Crosby and Graham Nash released a lovely version of this song on the CSN boxset from the early 90's...it was a studio recording dating back to the summer of 1971 and was originally intended to be a single until they had a huge row over the song and ditched it.

Fortunately the CSN archivist Joel Bernstein had kept the tape...

Of course both Nash and Crosby were previously Joni's lovers....