In "Mr. Tambourine Man," Bob Dylan uses the refrain to add the narrator's voice saying that he is going nowhere and would like to follow the Tambourine Man and his song on adventures.  The refrain adds emphasis to the idea of escape from daily boredom and nothingness.  Dylan asks to follow on the "magic, swirling ship" to go anywhere and to feel something again as he is now numb.  The repetition reminds the reader again and again that the narrator wants to "forget about today until tomorrow" and leave behind the deadly weariness which is his daily ration of life.  The refrain makes the reader realize how desperate  the narrator truly is to escape as the refrain keeps interrupting the dramatic pictures the narrator paints of his wishes to follow the Tambourine Man and his song.