slo said:
Fallout is a mass grave where all kinds of shit went wrong and it plays happy retro songs to create some kind of cheap dissonance.
I would argue that calling it "cheap dissonance" is sort of missing the point. In Fallout, yes the world is mostly tragically dead due to atomic warfare having wiped civilization nearly off the face of the earth. But (using the most recent Fallout game as an example) the world is experiencing a time of rebirth. Civilization is getting back on its feet and people have adjusted to the new world. Part of that is salvaging from the old world and rebuilding upon that foundation. That includes music.
The final days of the old world existed in a retrofuturist 1970, though the music depicts society from 20 years prior which could've been a result of the resource crisis not being a particularly ideal condition for the world of music to really grow. So those living a couple centuries in the future are left with the remnants of whatever music was left untouched by the centuries of wear and tear.
So here comes early civilization, working with what they have, listening to old music because life without music is quite frankly depressing. And (again, using Fallout 4 as an example) creating new music from that established foundation. If the music seems happy and uplifting it's because it's supposed to be. Think of the world immediately after the Great War and compare it to what it has become 200 years later. It's much brighter and it's getting better. And I think the music reflects that. Equating it to farting or Yakety Sax is entirely disregarding the world around the music.