You can unlock a significant portion of the base game's content simply by playing through the various modes.
: For users with modified consoles, tools like Goldleaf or Awoo can be used to manually install DLC files transferred via USB. Taiko no Tatsujin Drum n Fun -DLC Unlocker for ...
Unlock Taiko Mode Performance Characters. Taiko Mode performance characters are unlocked by playing the party games. Taiko no Tatsujin: Drum 'n' Fun! – Cheats - GameFAQs You can unlock a significant portion of the
: Performance characters for Taiko Mode are typically unlocked by playing Party Games . Taiko Mode performance characters are unlocked by playing
(on any difficulty, including multiplayer) is the standard requirement to unlock the full initial roster. Character & Item Unlocks : Many characters and drum accessories are tied to the Party Game
: This is the Japanese/Asian version. It requires DLC from the Japanese or Hong Kong eShop Accessing Other DLC
If you already own the game and want to unlock songs legitimately, the safest route is buying the DLC packs or the subscription (for the newer Rhythm Festival title, though Drum 'n' Fun! only has individual DLC songs/packs).