"Who had the biggest hit with Mr Tambourine man? Not the guy who wrote it!"

The Byrds had the biggest hit with Mr Tambourine Man. However, the original version of the song by "the guy who wrote it" considerably surpasses their version, in my opinion, as well as surpassing anyone else's cover of that song. That's just my own opinion, of course. Feel free to disagree with it all you want. Opinions are the spice of life, right? ;-)