I dont know about punk rock songs and some strong man speeches but I have found two links although with varied answers though with reasonable explanations.
SRC 1 : Wikibookpage - This page was last edited on 16 September 2019, at 14:36.
Let’s start with the form of the poem.
The poem is like a ballad, it is a free verse narrative. There are no
conventional rhymes, just some sporadically important ones.
The persona speaks directly in a personal voice(first person
singular). The poem seems to have a refrain – four last lines in
every stanza are the same. It is something that is very often used in
poems and songs. Angelou could have been inspired by her background in dance as the poem seems to have some musical aspect
(there is a set rhyme scheme and the refrain).
SRC 2 : Owlcation (As mentioned by A Student in the first answer)
Updated on August 21, 2019
There is a varied meter (metre in UK) in this poem, a mix of trochee and iamb with anapaest. The underlying beat in some lines is iambic, the well known da-DUM da-DUM da-DUM beat, the most common in English poetry. For example:
- But when I start to tell them/They think I'm telling lies.
And others have trochaic followed by iambic:
- When you see me passing,/It ought to make you proud. Still, others are iambic preceding anapaestic:
- The bend of my hair,/the palm of my hand,/The need for my care.
This variable rhythm, together with contrasting short and long vowels,
make this a particularly interesting poem to read out loud and to
listen to.
Also, It would be helpful if you take into consideration the fact that poems are an expression of the thought-process of the poet. It is the presentation of that his/her's view of the muse of that particular poem expressed in pithy words.
So, even poems with a well-defined overall metric pattern often have a few lines that violate that pattern.
SRC : Metre Variations, Wiki
I think the above fact is not done intentionally rather its the best way to express with minimum violations of the rhythm metre system. Similarly, with the above poem, I think the poet's thoughts were best enunciated using the above set of rhythm meters - a beautiful mix of trochee and iamb along with semblances of anapaest.