Shining Spirit is a music track that is unlocked down the trap door in the Ruins, north of the Graveyard of Shadows, next to the steel platelegs spawn. It can also be unlocked in the instanced Corporeal Beast cave. Unlocking it does not require having started the Spirit of Summer quest.
This track has an eerie yet magical appeal to it. One of the prominent features is its 'music box' like tune played through most of the song. The music grows louder and stronger towards the end of the track, before returning to its signature melody.