I haven't stumbled across any collections of German songs about the great and terrible war. Maybe they weren't in a singing mood. But the Yanks sure wrote songs! Anyone collected the Japanese natural flowering of song during the period when the Pacific Empire was contracting madly?
I am not so sure it is a matter of losers, but perhaps more a matter of the idealists who end up writing the songs. From the little I have seen, for example, there were more songs penned by Bolshies than by Czarists in the era of the Revolution. Haven't seen any Bush-camp folksongs, either, though. Pushing up from under is a good reason to contemplate ideals, even if you win!.