Whenever I listen to Bob Dylan’s song “Mr Tambourine Man”, I catch myself being surprised at the line:
I’m not sleepy and there is no place I’m going to.
Shouldn’t it be ain’t in this context? Googling for the line, I stumbled upon the same song but sung by The Byrds, so yes, it seems that my expectations when listening to Bob Dylan. are based on their version of the song. Ain’t of course does occur in another Dylan song, “It ain’t me babe”. So what happened? Which is the original version, why the difference? Any ideas?