白首（《与晋长安》影视剧情定誓言曲/插曲） is a somber, mid-energy track by 段奥娟 from 《与晋长安》影视原声带, released August 28, 2025. It runs 4:08 at 133 テンポ (266 テンポ double-time) in F Minor (Camelot 4A).

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