Not sure why you were downvoted, it is super interesting. I know nothing of songwriting but it seems like that could be read by a singing performer in similarly to how sheet music is read by an instrument performer. In the graph, there's additional information than just the words that a singer would need to perform the song accurately.
/re-iterate i know almost nothing of music except what i like which i've been informed over and over is incorrect hah.
I've been a musician for nearly 3 decades and this diagram is how really good songwriters think about structuring popular music. They just usually don't write it down like this. It's not only useful for lyrics, but for harmonic progression as well. As for the downvotes, it's probably because most here don't understand songwriting and think the diagram was nothing more than a joke.
I think there should be "An Infinite Literature Contest", where the contestants would submit a formal grammar and the texts in the language would be judged for literary and other qualities.
/re-iterate i know almost nothing of music except what i like which i've been informed over and over is incorrect hah.