Shame

1. I think the subject of the song is shame. The tone of the song is begging and regretful.
2. One word that pushes the tone is "undo". He uses undo to show how he regrets doing something and that he wants a chance to to do it over. Another word is "please". He uses please to show how he is asking and possibly begging for what he wants, which is for the shame to be lifted off of him. The third word that pushes the tone is "helping". He uses the word helping to show how he is begging for someone to help him lift the shame off of himself.