This is a purchase bonus for the Monster Hunter Wilds Cosmetic DLC Pass.
The following content is included:

【Premium Bonus】
●BGM: Proof of a Hero (2025 Recording)

*After downloading, this content can be received in-game from the Support Desk, and can be used from 'Change BGM' under 'Tent Settings Menu' in the tent.
*Background music during quests cannot be changed

*This bonus may be available by alternative means at a later date.
*You may need to update to the latest version of the game to use this content.