As a variation of the idea of having a ten-hour music compilation, one idea might be to put together, in the correct order for the major phases of the game, a sequence of tracks that would each be played (for inspirational purposes) at the start of the appropriate game turn. In Global, for instance, an example would be to play “Denn wir fahren gegen Engelland” (“For we are sailing against England”) and “There’ll Always Be an England” at the start of the Sealion turn.
In an earlier discussion of game music, I think someone said that during their games they play, as low-level atmospheric background music, selections of 1940s songs intercut with wartime news bulletins and so forth, which is a pretty neat concept.