Before we get into the specifics of symbols (which, in the case of this poem, shouldn't be a particularly difficult explanation), I'd like to touch on the meter and rhyme scheme. If you are familiar with the concepts of meter, you may have noticed that this poem is set to what would seem to be an altered iambic trimeter. The alteration is very slight: a substitution of a single tribrach in place of the last iambic metra of every odd line. ((If you're unfamiliar with meter and would like the concept explained, then please let me know by leaving a comment, and I will make a post explaining the basics as soon as I can.)) The easy sort of bounce and obvious beat that the song has is provided by the rising stress of each disyllabic unit. The simple rhyme scheme (ABABCDCD EFEFGHGH) also contributes to the easiness of the song and prevents the subject from feeling overly forced by use of other unnecessarily more intricate schemes.