Stage Clear (music)
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It's played on the Pearl collection screen after beating a boss.
It sounds like Stage Clear from Densetsu no Starfy, but it seems to be unused other than appearing in the Sea Jams. It can be unlocked in the Sea Jams by beating 11-5 after completing the game once. 
- Densetsu no Starfy 2 strategy guide Shogakukan pp. 268