Replying to Give me song names. Get Karmaz!

So we were assigned an essay to compare and contrast a poem to a song with a similar theme. The choices we have for poems are The Road Not Taken (theme is about making choices in life) Much Madness is the divinest sense (about how what the majority accepts can be crazy although if you disagree youre labeled as crazy) Mirror (about the difference between truth and lies or having preconceptions and no preconceptions i think) and the man he killed (about killing people for no reason in war). now, since many of you are probably much more knowledgeable about music than i am, it would be awesome if you could give me a few songs that relate to these poems to help me out