One real problem with Civs soundtrack is that, while there's some original music, they also have actual songs that existed before the game. This means that while it's all well and good up to a point (more or less, depending on personal opinions), towards the modern era one has to deal with the fact that truly modern songs are hard to aquire because they aren't public domain. The result is you're stuck with the sort of thing that feels more at home in a grainy old silent film than any other thing. It's too old to be considered modern, and much of it's too forgettable to be called Classical. It's not like I don't like Sheherrazadde, but it certainly isn't the sort thing that goes well with me dropping an ICBM down Isabella's chimney! As for the "The People are Heroes," I think that one's just an awful song; plain as that.
In fact, one thing about my personal tastes is that I actually like some of the earlier music in Civ4 a lot better than what comes later. The reason might be is that it necessarily has a more wild, aggressive and upbeat style to it than the so-called Civilized stuff that came later. There's more room for African, Celtic, and Native American music, which often has a stronger beat, in those eras before European empires wiped such peoples out. My wish is that the modern, more "free" era could bring a bit of the game full circle to the way actual modern music sounds; that is, use some of the aggressive beats borrowed from African music, but with the technology that requires civilization. Unfortunately, Civ4 didn't do that; it's modern era is still totally white-bread in its musical focus, but there's a chance to fix things this time around.
I'm not asking specifically for jazz music, or blues music, or rock music, or rap music, or dance music--but that doesn't mean I want none of them in the game. Like it or not, they are valid modern genres; you can't just reduce the whole modern era to the early portion of the 20th Century where only Classicly-trained white people wrote famous music. Nor can you reduce all of the modern era music to America and Britain anymore if you go into the most present-day view of modernity--newcomers like Japan and Sweden need recognition, too.
I'm not asking for all of my favorite songs to be in Civ5. I'm asking that a very fair and accurate representation of modernity gets into the game this time; if that means licensed music like in Grand Theft Auto, so be it.