I forgot to mention it, but I beat Doom II: No Rest For the Living! Interesting little expansion that has eight levels as if it was an episode from the first Doom. Won't post a screenshot because the end screen was the same as Doom II's, so it'd be kind of look like I posted the same one, but I liked it! Levels were cool. Currently playing through Sigil, when I beat that I will post about it.
In conclusion, "La la la la la" is commentary on how the cycle of life may seem eternal and shows how with few communication, one can convey a complex thought.