Getting back on rant, again, how is Joni Mitchell 'folk music'? Worse, the damned topic says Gordon Lightfoot, which under no definition of folk music would he (or the song Sundown) be included (not even a Brit definition). Someone shoulda railed on the doofus who created the thread the day it happened. It's pop music, period. Easy Listening. Whatever. But not FOLK music.
Folk music is protest music (see: Pete Seeger; Peter Paul & Mary). What next, Harry Chapin was 'folk' music? The next protest song Lightfoot or Mitchell write will be the first one they write. Joni is as much jazz (see Mingus album) as folk if you're going to cubbyhole her incorrectly.
Get your definitions right and heads outta your arses.
*musician and OCD asshole climbing down from soap box*
Some folk music is protest music, some protest music is folk music, but the terms are not synonymous. Listen to this, traditional folk music - what's the protest angle on that?
If you think folk music is just protest music I suggest you need to broaden your horizons.