The normal background theme is the music that plays in Saint Mocianne's Arboretum, Poison Ivy: https://youtu.be/5h7KyokeLmM
The battle theme against Hunar/Angel is the basic overworld battle theme, The Land Burns: https://youtu.be/iTzeFheWlTo
The music in Odin's trial is The Corpse Hall: https://youtu.be/qAp8U5z9cjQ
No discs as far as I know.
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