A 1/10 in the music section? Way too harsh. Bethesda actually did lots of homework on the music, and with a proper explanation, it fits absolutely perfect.
Although the music may not seem fitting, the science behind it makes perfect sense. All of the songs from the soundtrack originated around the 1940's and 50's. Back then, music was recorded onto 78 RPM Vinyl Records. These were known for their great sound quality, but had something that most people often overlooked: durability. The 78 RPM's were extremely strong, and could take a beating, and still play with their utmost quality. One could run a heftily sized truck over a 78 Record and it'll play fine.
Now we must look at nuclear bombs: They blow stuff up, and do a good job at it. Simple.
When the nuclear bombs fell on Washington D.C. and the country's surrounding areas, it is extremely likely that they destroyed most of the music storage mediums. CD's, Cassettes, iPods, whatever. You name it, the bombs probably destroyed it... With the exception of our beloved 78 RPM Vinyl Records. These beasts could easily survive the blast, flex their high-quality muscles, and spit on the corpses of all the inferior storage mediums that were too wimpy to survive the detonations.
Aaaaaand, since all of the songs featured in Fallout 3 were stored on 78 RPM Vinyl Records. It makes perfect sense that these songs were featured in the game.
SCIENCE!