Whoops. Nope, it was Loudon Wainwright III.
https://www.imdb.com/name/nm0906525/?ref_=ttfc_fc_cr
the Youngbloods’ hit song was written by Chet Powers:
https://secondhandsongs.com/work/4730
Loudin was of dead skunks and drinks before dinner fame.
Some may come and some may go
He will surely pass
When the one that left us here
Returns for us at last
We are but a moment’s sunlight
Fading in the grass
Come on, people now
Smile on your brother
Everybody get together
Try to love one another right now