Just so you know: On a lark, I used Google to search for "Joni Mitchell River" and came up with several mp3 sites that had links that read: Joni Mitchell River, but they brought up an MP3 recorded by someone else that doesn't sound anything like the original. This mp3 has an over-enunciating singer and a much worse piano sound. Some kind of synth piano. The original album doesn't sound anything like this mp3.
This is worrisome outside the context of what we've been talking about. People having heard the recent cover of the song might Google it and come up with this bad version, and think that it was the song on the album. I'm not even sure why this mp3 has been posted--it's not for sale, so the creator isn't exactly posing as Mitchell to gain income. Instead, it's just dumb. It doesn't help the creator and it damages Mitchell's reputation because it clearly represents itself as a recording by her. This kind of thing hurts everybody.
(I did find one or two mp3's from the original album, but they were either converted to an early version of the mp3 format or are strong arguments for avoiding the mp3 format entirely. The vocal suffers a lot, as it always does on mp3's of anyone with a wide range, and the piano sounds even worse.)