Good idea! Missed a couple that I should have gotten. I guessed Phil Ochs right off the bat, but to no avail; perhaps one of his songs could appear on a sequel some day.
Revisiting this quiz a few months later, I'm shocked the percentage for Bob Dylan is so low. I assumed that even if people don't recognize that particular song, Dylan would be an obvious guess on a quiz like this, but perhaps not. Perhaps I should have gone for something more obvious like Blowin in the Wind.