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Depends.

As long as you can offer up MP3:s without copyright issues, it is not a problem. (Also non-profit, non-spam etc.)

So, if it is neither evil, nor illegal, you should be able to go ahead.
 
There was, but only on the original disc. It was delivered in .wav form on the disc, and for size and/or licensing reasons was removed from later versions.

Oh,anathematic licensing reasons!
I want paradox sell musics and patch for early products.
Lack of music make them barren.