What Dylan has always done isn't exactly poetry, and it isn't exactly singing either. So an answer refusing to come down on one side or the other was a reasonable enough answer to give.

All right, not literally accurate, because he's not much of a dancer so far as I've ever seen, but implicitly it means more or less "I get up and performs, whatever you choose to call it, and it's up to the audience to decide if they like me or not". But the short form gets the message across more effectively.