Conversation so far:
What artists did John Denver work with?
John Denver began his recording career with a group that had started as the Chad Mitchell Trio.
Who was in the Chad Mitchell Trio with John Denver?
The Chad Mitchell Trio was John Denver, David Boise and Michael Johnson.
Did John Denver and the Chad Mitchell Trio record any albums?
John Denver recorded three albums with the Mitchell Trio, replacing Chad Mitchell himself as high tenor.
What songs were on the John Denver and the Chad Mitchell Trio albums?
John Denver's distinctive voice can be heard where he sings solo on Violets of Dawn, among other songs.

Question: did he work with anyone else
Self-contained rewrite: Did John Denver work with anyone else besides the Mitchell Trio?