Have you found the answer to that question?
Meanwhile, I have my own Baez question for you... Name the science-fiction movie for which she did a song that was played during the opening credits.
I haven't a clue. Baez? SF? Wow.
Silent Running... Considering the subject matter, it's not surprising that Baez got involved in this early Seventies movie. It is about Earth's last forests, which are kept in domes hooked to spaceships. Then one day, they decide that the ships could be put to better use and order the forests destroyed. One ship though has a crewmember who, rather than letting that happen, kills the rest of the crew and escapes with his ship and its forests to the outskirts of the solar system.