I loved the wonderful Mama Cass version for years before I realized it was an old song. Now I sing it for the 'rents (who are in their 80's) and they love it.
I think this song was my personal singing breakthrough. I had previously stuck with safer stuff, like Johnny Cash (voice somewhat similar to mine, and quite straightforward), thought it would be an insult to Cass, but tried it anyway, and it came out fine. That boosted my courage to the point where I was willing to try anything.