At the center of the punk movement of the seventies were works of poetry: the lyrics of Johnny Rotten of The Sex Pistols. In fact, an argument could be made that the most powerful single song lyric in rock history is found in "God Save the Queen".
Let's leave aside all of the self-evident stuff (the sociological impact, etc.) and consider the words and ideas; they are what matter (and what last). There are two primary reasons for the power of this lyric: 1. Because the stakes are so high: The song challenges listeners to question virtually every assumption they've ever made in regard to country, ruler and religion. This had happened before in the history of poetry, of course (see World War I poetry such as Wilfrid Owen's "Dulce et Decorum Est" for an example), but not in rock. 2. The lyrics themselves fit every criterion of serious poetry. Here is the crux of the song:

When there's no future
How can there be sin?
We're the flowers in the dustbin
We're the poison in the human machine
We're the future
Your future

The first two lines ask a philosophical question of the highest order. The next two contain metaphors of startling originality and power. The last two are a threat/promise that actually came true: It's easy to see with retrospect that no rock band of that era came close to matching them for impact or influence. Would that have happened without the poetry?