Music is a bit of a mess in PoW. The problem is that twentieth century music is built heavily on American style. Without the American styles we are used to, what would have been prevelant? Classical and folk music? If we had decided to follow a safe and believable pattern, I suppose you'd have Jazz in the US (or rock if that evolution took place), a sort of mass-market Spanish folk in Spain, and more traditional versions of local music traditions everywhere else. 

But Aaron and I jumped the track a bit and imported American styles into our respective countries early on, and that seems to have become a general theme. So now there is a sort of Africanized version of Dixie Land Jazz in Africa and the Mediterranean, Robert Johnson-esque Blues Guitar in China, and a sort of watered down Tommy Dorsey type big band in Spain. Byrd has also referenced some sort of early rock music type thing that seemed an awful lot like Ritchie Valens. 

What would that mean for Europe? I dunno. I'm trying to imagine some sort of protest polka. Since we've already established American styles elsewhere, you could use them here, though I'm not sure full-out Bowie stuff would sell yet.