I'm rooting for "OMD - Enola Gay".

It fits well in the Fallout universe.

It isn't that society stagnated for 120 years - it's that the future progressed as the 1950s people envisioned it would. Technology marches on, but culture remains the same. The whole setting is very much meant to feel like a 1950s sci-fi author's vision of the future - complete with silliness and not thinking through the drastic social changes some technologies would realistically bring.

Unfortunately, thanks to Disney, copyright isn't that simple. Most of the songs in Fallout 3 are NOT in the public domain. And you have to remember, that even if a SONG is in the public domain, specific recordings of it may NOT be.

Still, whether its PD or need Licensing, I think having them widen the range of music or atleast narrowing down how the divergence may have differed music would help give us an idea of what to expect. Because if they said that because of the divergence that Taylor Swift or Van Halen or Led Zeppelin didn't come about, it may or may not show us how this landscape has been sculpted. Big names in music helped not only shape cultural identities with music, but also shaped political identities as well as international identities. A big name like the Beetles helped shaped not only music but culture and if they were never formed, the world could of been different.

The Wanderer and the Rock station will do for me, i'm assuming that mean's 50's and early 60's Rock n Roll songs.

I think it is pretty obvious that the world WAS different in Fallout. The point of divergence with our timeline is sometime in the 1950s. The counter-culture never happened.

I believe we can infer a few things:

JFK was never assassinated in the Fallout timeline, so conspiracy theories and a lack of trust in the government never took root with the youth.

The U.S. won in Vietnam, so the public never became disillusioned with war - possibly with the use of nuclear weapons (as was original considered in our timeline).

This sets a precedent of using small nuclear devices in war, and leads to a much more intense and stressful Cold War with Russia and a now pissed off China (since we nuked their border).

The Anti-Nuclear movement dies in it's infancy.

The government maintains a much tighter grip on the public, and is supported by the media outlets.

Social movements like feminism and civil rights were much more gradual, stalled by larger national concerns, and took place on multi-generational scale, rather than within a single generation.

Musical movements that rose from the counter-culture never emerge.

All conjecture, but pretty likely.