This is a journal for Astral's various themes, by category. It includes most, but not all of the total soundtrack. Please report any broken links.
Astral's website can be found here: http://astralthegame.blogspot.com/

Battle Themes:
Random Encounter Theme: Raised Courage
Boss Battle Theme: Building Tension
Final Boss Theme (phase 1): The Final Retournen
(Can't say who) Battle Theme: Battle Amongst Users
Endgame Boss Theme: Rage of Eternity
Maximum Courage

Main Themes:
Title Music: Prelude to Astral
Overworld Theme: Across the Starry Plains
Airship Theme: Freedom in Flight

Town Themes:
School Theme: Brimming with Peacefulness
Xylokoto Theme: Xylokoto Jazz
Village Theme: Serene Winds
Market Theme: The Market Mosey
Snow Village Theme: Snow Passacaglia
Kingdom Theme: Kingdom Theme

Area Themes:
Final Dungeon Theme: Awakening Arena
Normal Ruins Theme: Ruins Theme
Retournen Ruins Theme: Origin of All

Character Themes:
Hayner's Theme
Duraine's Theme: Ballad of Miracles