I think it was a lone male singing, and if I remember correctly, he reminded me of Doc Watson singing. I said it might be Raffi because that's what my parents and siblings said it might be, but it was over a dozen years ago. I believe the instrument they played was guitar.

There were some other songs on the CD, but I'm having a hard time remembering them. I'm pretty sure one I liked might have had to do with a train (descriptive, I know) and another was about John Henry vs the machine, but I don't think it was THE John Henry song.