This was fun to read. Thanks for posting it her.
FWIW: I always thought that Joni was laughing at the fact that she couldn’t hit the low note at the end of the song.
I love her despite her cranky scolding of free concerts (on an appearance Dick Cavett she complained that all the “kids” want everything for free), sex, and Bob Dylan, and try to look past her holier-than-thou Jazz pontifications.