You can find the Original Soundtrack on Steam or listen to the full deconstructed set on David Dirig's SoundCloud.
If you are referring to a "piece" of equipment or a specific dungeon floor, the game features a massive treasure on the that you must retrieve and carry back to the start to win. Legend of Dungeon - Robot Loves Kitty Legend of Dungeon
The music adjusts as you move through floors or face specific enemies, such as the Guardian or Vampire . You can find the Original Soundtrack on Steam
In the context of the indie game , a "piece" likely refers to the unique, dynamic music system created by composer David Dirig . Legend of Dungeon