I don't know if it is available on CD or any other format, but you can find a pretty good version of "Blackbird" by Crosby, Stills & Nash on YouTube. It's live. I suspect there are several versions available on YouTube.
Blackbird was one of the first songs CSN ever did together. Their 3-part harmony is very good on this song, as it is on everything else they have done. (Maybe they'll resolve their differences someday.)