Here's a good list of the songs with their release year:
http://bioshock.wikia.com/wiki/BioShock ... Soundtrack
and here's a list of copyright lengths by the countries:
http://en.wikipedia.org/wiki/List_of_co ... ht_lengths
I think the European law is more human readable than the U.S one. There are some exceptions to that 70-years i U.S laws. It can also be 120-years if the content was created by corporation or if the copyright has been extended.
I should also state that I'm not a lawyer and I'm not providing any legal advice.