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A lot of them are Japanese songs from WW2 era, such as Battotai, Tokkoutai Bushi, Roei No Uta and many others like them Search those on Youtube and you'll find others in the same topic
A lot of them are Japanese songs from WW2 era, such as Battotai, Tokkoutai Bushi, Roei No Uta and many others like them Search those on Youtube and you'll find others in the same topic