Hey! Thank you for the question <3
First of all, I have to say I don’t really believe there’s such a thing as uncultured, so your experiences with music, whatever they may be, can very well be enough to inform your entry! Also, you don’t have to stick to music at all, if you don’t feel like it. If you want to keep the setting, you could show us another facet of it, unrelated to the musical side. Or you could just create another setting entirely!
Still, to answer your question about inspiration, much of what I had in mind while making MMnMM was punk rock DIY flyers and posters aesthetics, that grungy, collaged, photocopied look, so a quick google search for things like “punk flyers” or “punk posters” can give you a lot of insight about it. Stuff like The Clash, Sex Pistols and the New York Dolls were on my mind. Also, lots of “classic” heavy metal and prog, like Pink Floyd, King Crimson, Led Zeppelin, Jethro Tull. And also that cheesy hard rock/metal that I love, with all that hair and skinny clothes, like Van Halen, Bon Jovi, Alice Cooper, Kiss, Journey etc.
I hope this has been helpful. If you have any more questions, please ask away!